Foreign Key

A foreign key is a way to connect two related pieces of information in different sets of data, usually in a database. Think of it as a link or reference that ensures data remains consistent and accurate across tables. For example, in a school database, a student record might refer to a specific class using a foreign key that points to the class’s details. This relationship helps organize data logically, prevent errors, and makes retrieving related information efficient. Essentially, a foreign key acts as a bridge that ties related data together reliably.