PSD

Category
Raster Image Files
Common?
Yes
File Description
Document created by Adobe Photoshop; can include image layers, adjustment layers, layer masks, annotation notes, file information, keywords, and other Photoshop-specific elements.Supports RGB, CMYK, grayscale, monochrome, duotone, indexed color, Lab color, and multichannel color modes.
Program(s) that open psd files:
Adobe Photoshop or Photoshop Elements