Application Programming Interface (API) is a feature of SEMrush that allows you to receive the raw data offered in SEMrush without having to manually log into the software. By making an API call, you will be able to receive information right in your browser without having to navigate into SEMrush itself.
The API Documentation page will be key for working with the API as every call will be broken down and explained for you here. The proper formatting will be displayed as well so that you are able to correctly structure your API calls. These calls can be made by pasting your API call in a web browser. This will then spit back this information for you.