The Face API has two main features. The first one is face detection and the other is face recognition.
Face detection allows one to detect up to 64 faces in one image. We have already seen the basic usage. The features of face recognition are implied in its name. Using it, we can detect if two faces belong to the same person. We can find similar faces, or one in particular, and we can group similar faces. We will learn how to do all of this in the following pages.
When calling any of the APIs, it will respond with one of the following responses:
| Code | Description |
| 200 | Successful call. Returns an array containing data related to the API call. |
| 400 | Request body is invalid. Can be a number of errors, depending on the API call. Typically, the request code is invalid. |
| 401 | Access denied due to invalid subscription key. The key may be wrong or the... |
