What is the difference between a candidate key and a primary key?

Question

Is it that a primary key is the selected candidate key chosen for a given table?

Answer 1

Primary key -> Any column or set of columns that can uniquely identify a record in the table is a primary key. (There can be only one Primary key in the table) and the candidate key-> the same as Primary key but the Primary Key chosen by DB administrator's prospective for example(the primary key the least candidate key in size)