The following functions are all related to "textures", ie: images that are stored in VRAM to be used as sprites or other things within your game. The first set of functions available are used to retrieve information about specific images and their position or size on the Texture Page, as well as set certain texture features:

GameMaker Studio 2 also has a number of functions related to the managing the VRAM associated with individual textures as well as whole texture groups:

Finally, we have the following functions which are primarily for use to debug the project and ensure efficient use of texture memory: