what is special category data

Quick Scoop: Special category data is a type of personal data that gets extra legal protection because it is especially sensitive. Under UK GDPR, it includes data about racial or ethnic origin, political opinions, religious or philosophical beliefs, trade union membership, genetic data, biometric data used for identification, health, sex life, and sexual orientation.

What it means

In plain English, this is the kind of information that could affect someone’s privacy, safety, or rights if handled badly. The ICO notes that it should be identified and treated carefully even when it does not seem obviously sensitive at first.

Examples

• Medical records or health conditions.

• Biometric identifiers used to confirm who someone is, such as fingerprint or facial recognition data.

• Information about religious beliefs or political views.

• Data about someone’s sexual orientation or sex life.

Why it matters

Because it is more sensitive than ordinary personal data, organisations usually need a lawful basis to process it and a separate condition under data protection law. The rules are stricter than for standard personal data.

Important note

Not every sensitive-sounding detail counts automatically; the key question is whether the data reveals or concerns one of the protected categories. The ICO also says some inferences can count if they clearly reveal special category information.

If you want, I can also give you a 1-line definition , a student- friendly version , or a UK GDPR vs EU GDPR explanation.