Natural Language APIs is a collection of APIs that convert unstructured data to structured data in Natural Language Processing. The Language APIs can analyze text and help you to understand its entities, attributes, relations and more.
Vision API offers image analysis. The Vision API can identify the specific object like cockroach in a given image, and also give out the probabilities of each candidate.
Cross Media API offers sentences generation from image. The Cross Media API can recognize the objects and activities in a given image, and output several sentences which gives a description of the image.