There are three types of data used in CV applications: images, videos, and depth maps. Images are the most common type of data used, as they can be easily captured and processed by computers. Videos are also commonly used, as they can provide a continuous stream of data that can be analyzed to detect objects or people in a scene. Depth maps are less common but can be used to create a three-dimensional representation of a scene, which can be useful for applications such as object recognition or navigation.