The Microsoft Azure Cognitive Services Computer Vision API analyses images and returns information about them. It can be used to filter mature content or to detect faces in an image. Information such as image description, and dominant and accent colors can also be retrieved. Additionally, this API recognizes celebrities, reads text in images, and generates thumbnails. Currently, a free plan that limits calls to 5000 transactions per month is available. The Computer Vision API uses JSON format for data exchange, and API Keys for authentication.