Discover what the different types of data mentioned in the GDPR are and how to handle them correctly to stay compliant and avoid mistakes and penalties.
Have you ever wondered what the different types of data mentioned in the GDPR are, and whether in your work or business you process personal data without even realizing it?
Do you have a website, a contact form, a newsletter, or a customer database and worry that you may not be fully GDPR compliant?
Or do you hear about sensitive data, health-related data, biometric data, and feel unsure about what they really mean, which data must be protected with extra care, and which can be managed with simpler procedures?
If you recognize yourself in any of these questions, you are in the right place. The GDPR is not just a set of abstract rules: it affects the daily life of companies, professionals, associations, and citizens. Understanding the different types of data under the GDPR helps reduce risks, work more confidently, and show respect for the personal information of the people you interact with.
In this article, you will find a clear, practical, and up-to-date guide explaining the data mentioned in the GDPR, the different data categories, when they can be processed, and what precautions must be taken to avoid mistakes.
Table of Contents
- What Is Considered Personal Data Under the GDPR?
- Common Personal Data: The Most Widespread Category
- Sensitive Data and Special Categories of Personal Data
- Racial or Ethnic Origin and Personal Beliefs
- Health-Related Data and Private Life
- Genetic Data and Biometric Data
- Criminal Data and Legal Information
- Anonymized and Pseudonymized Data
- Why Knowing Data Types Is Essential
- FAQ – Frequently Asked Questions About GDPR Data
What Is Considered Personal Data Under the GDPR?
To understand what the different types of data mentioned in the GDPR are, we must start from the basics: what is meant by personal data.
The GDPR defines personal data as any information relating to an identified or identifiable natural person. This means it is not limited to first and last names. An email address, a phone number, an IP address, or an online identifier can also be personal data.
A practical example: if you run a website and collect email addresses for a newsletter, you are already processing personal data. If you use a customer management system with names, addresses, and purchase history, you process personal data in a structured way. Even a simple contact list on a smartphone falls under this definition.
The key element is identifiability: if information can be used, directly or indirectly, to identify a natural person, then it falls within the scope of the GDPR.
Common Personal Data: The Most Widespread Category
The first major data category under the GDPR is common personal data. These are the most widespread and often the most underestimated.
This category includes information such as first and last name, home address, email address, phone number, date of birth, tax identification number, billing details, and bank account information. Even work-related details, such as a job title or company name, may be considered personal data when linked to a specific individual.
These data must be processed lawfully, transparently, and limited to the stated purposes. This does not mean they are “less important,” but simply that they do not fall under the special categories of personal data discussed later.
A common mistake is thinking that only “sensitive” data are subject to the GDPR. In reality, even a simple email contact list is fully included among the data mentioned in the GDPR.
Sensitive Data and Special Categories of Personal Data
When talking about the GDPR, one of the most confusing topics is sensitive data. The regulation actually uses the term special categories of personal data, referring to information that is particularly delicate for individuals’ rights and freedoms.
This category includes data that, if misused, may lead to discrimination or serious privacy violations. For this reason, they must be protected with stricter measures and, in many cases, processed only under specific legal conditions.
These data relate to the most personal aspects of an individual’s identity, private life, and dignity.
Racial or Ethnic Origin and Personal Beliefs
Among the special categories of personal data are data relating to racial or ethnic origin. Although this type of information is collected less frequently today, it may appear in specific contexts such as statistical studies, research projects, or academic activities.
This category also includes political opinions, religious or philosophical beliefs, and trade union membership. These are deeply personal details that reveal significant aspects of an individual’s identity and, if disclosed or misused, may result in discrimination or social exclusion.
For this reason, the GDPR states that such data must be processed only in clearly defined cases, such as with explicit consent or for reasons of substantial public interest.
Health-Related Data and Private Life
Health-related data are among the most sensitive of all. This category includes any information relating to a person’s physical or mental health, such as medical reports, diagnoses, certificates, disabilities, and insurance data linked to health or life.
Even seemingly harmless information, such as participation in a fitness program or the use of a health monitoring app, may be considered health data if it allows conclusions to be drawn about a person’s physical condition.
Anyone who processes this type of data must be particularly careful: restricted access, high-level security measures, and a solid legal basis are essential requirements to remain GDPR compliant.
Genetic Data and Biometric Data
Another fundamental area concerns genetic data and biometric data. Genetic data refer to information about a person’s inherited genetic characteristics, obtained for example through DNA analysis.
Biometric data used to uniquely identify a natural person include fingerprints, facial recognition, iris scans, and voice recognition. These technologies are increasingly common, especially with smartphones, workplace access systems, and security solutions.
Such data can be processed only under very specific conditions because they enable direct and often irreversible identification. Once compromised, they cannot be “changed” like a password.
Criminal Data and Legal Information
Among the data mentioned in the GDPR are also data relating to criminal convictions, offenses, or security measures. These do not formally belong to the special categories of personal data, but they are still subject to very strict rules.
These personal information items may be processed only under the control of a public authority or when explicitly authorized by law. For private companies or professionals, processing this type of data is rare and usually limited to specific cases, such as employment in regulated sectors.
Anonymized and Pseudonymized Data
Not all data are the same from a technical perspective. The GDPR distinguishes between personal data, pseudonymized data, and anonymized data.
Anonymized data are information that no longer allows identification of a natural person in any way. In this case, the GDPR does not apply because personal data are no longer being processed.
Pseudonymized data, on the other hand, are data where the identity is hidden but can still be recovered using additional information. These data remain subject to the GDPR and must be adequately protected.
Why Knowing Data Types Is Essential
Understanding the different types of data under the GDPR is not a theoretical exercise. It is a practical necessity for anyone working with customers, users, patients, or citizens.
Knowing which data category you are handling allows you to choose appropriate security measures, inform individuals correctly, and demonstrate GDPR compliance in case of inspections.
Many penalties result not from bad faith, but from lack of awareness. Knowing the data mentioned in the GDPR helps reduce errors, build trust, and work in a more professional and responsible way.
FAQ – Frequently Asked Questions About GDPR Data
The GDPR distinguishes between common personal data, special categories of personal data (often called sensitive data), criminal data, biometric data, and genetic data. Each category has specific processing rules and protection levels.
Personal data means any information relating to an identified or identifiable natural person, even indirectly, such as email addresses, IP addresses, phone numbers, or location data.
No, sensitive data are not absolutely prohibited. They may be processed only in specific cases provided by law, such as explicit consent or substantial public interest reasons.
Yes, health-related data always fall under the special categories of personal data and must be protected with enhanced security measures.
Yes, political opinions are considered special categories of personal data because they concern the most intimate sphere of an individual and may lead to discrimination.
No, but biometric data used to uniquely identify a natural person must be processed only with strong safeguards and a valid legal basis.
Processing personal data includes any operation such as collection, recording, storage, consultation, modification, or deletion.
No, if data are truly anonymized and no longer allow identification of a person, the GDPR does not apply.
No, consent is only one legal basis. In many cases, processing may be lawful due to legal obligations or legitimate interests.
Being GDPR compliant means protecting individuals, reducing legal risks, avoiding penalties, and demonstrating reliability and responsibility in how personal data are processed.
This post is also available in: Italiano (Italian)
