When a user purchases a software product, they are usually provided with a serial key that they need to enter during the installation process. Once the serial key is entered, the software is activated, and the user can access all its features and functionalities.

A serial key, also known as a product key or activation key, is a unique code that is used to activate and unlock a software product. It is a critical component of software licensing, allowing software developers to control access to their products and prevent unauthorized use.

Serial keys work by verifying the authenticity of a software product and ensuring that it has not been tampered with or pirated. When a user enters a serial key, the software checks it against a database of valid keys to ensure that it is legitimate.