Hi! Are you going to creating an application that requires Google data for it? For this purpose, you need Google APIs. Google Developers Console is a site that is used by the developers for managing and viewing traffic data, authentication, and billing information for Google APIs. To access the Google APIs our project must be registered on Google Developers Console with your Gmail.
When we creating a project on the Google Dev console Google give can keep track of which applications are making requests to their APIs and make sure that the API is not being extremely spammed by one application.