An organization can extend G Suite by enabling API access so that developers can create software that integrates with the services and optimize the way things work to best suit the organization's needs.

API access is required for external applications to integrate with G Suite. Keeping it disabled will prevent all users from installing third-party applications, so it's a good idea to turn it off unless it's necessary to keep things safer. You can use the Enable API access checkbox to enable or disable API access:

The administrator's console also has an API that allows developers to extend and customize it for the organization's needs so that it can facilitate the administrator's tasks.

The Admin SDK settings can also be found on the same page:

The Admin SDK allows organizations to build tools tailored to their very unique need; you will learn how to your own custom tools in the next chapter, but before that, let's continue to the next section to learn how to Set up single sign-on (SSO).