Definition
A record for one person: name, email, phone, the company they work for and the history of every interaction with them.
Contact explained
Contacts are the core record in a CRM. Each one usually links to an account (their company), any open deals, and a timeline of emails, calls, meetings and notes.
Good contact data depends on deduplication and on syncing email and calendar automatically, so reps don't have to log everything by hand.
Also referenced in: CRM