Personal data is all information about an identified or identifiable natural person. This means that information is either directly about a person or can be traced back to this person. Information about deceased persons or organisations are not personal data.
There are many types of personal data. Obviously name, email, physical address are personal data. But also telephone – and credit card number, license plate, social security number, IP-address or geo-tracks are all personal data. Data that involve topics such as health, religion, or ethnicity are considered sensitive personal data.
If you conduct research about identifiable persons or in cooperation with identifiable external recruited participants, answer Yes.