This video demonstrates cPanel's Manage API Tokens interface. An API, or application programming interface, allows you to interact with a program. cPanel & WHM API functions allow you to create, modify, and remove information on your server (among other things). For example, you can create an email account all from the command line.
Related Documentation:
Manage API Tokens - https://docs.cpanel.net/cpanel/security/manage-api-tokens-in-cpanel/
How to Use API Tokens - https://docs.cpanel.net/knowledge-base/security/how-to-use-cpanel-api-tokens/