There are 2 file types use the .XMP file extension:
1. Extensible Metadata Platform File
An XMP file is a metadata file used by Adobe programs such as Photoshop and Bridge. It contains the edits made to a camera raw file, such as a .CR2 or .NEF file, and is automatically generated and saved in the same directory as the corresponding camera raw file. XMP files include various properties of an image file, such as a description, title, keywords, author, copyright, brightness, exposure, contrast, crop angle, shadow, saturation, sharpness, tint, and temperature.
Updated: March 11, 2019
2. XMind Markers Package
An XMP file is a markers package used by XMind, a mind mapping and brainstorming application. It contains one or more markers, which are icons used to denote special meaning such as the urgency of a task or what people are involved. Some of the marker categories include faces, task progress, task priority, arrows, symbols, and month.
While XMind comes with default XMP files you can import your own images into the application for customized markers. You can access the import and export functionality by selecting the "View Menu" icon when the Markers window is open.
Updated: December 30, 2015