Personal data is information that relates to individuals who can be personally identified from that data. It includes, amongst other things: names, addresses (including email addresses) and telephone numbers.
There is a further 'special category' of 'sensitive personal data', which includes information about: physical and mental health or condition and genetics. Sensitive personal data requires extra protection. For more information on personal data and sensitive personal data, read Data protection.
Data processing is any use of personal data (other than for personal reasons) and includes: obtaining, recording and storing personal data. For more information, read Processing personal data.