Offset moves the current layer or channel up, down, left, or right by the chosen number of pixels. When the edges overrun the dimensions of the layer, you can decide if they are wrapped or not. Offset can be used to place layers or floating selections at a specific position in the image.
Offset is useful if you want to move layers a very exact amount or if you'd like to move them without extending the layer border. The other important application of this command is to create seamless tiles for patterns.
If the "Wrap Around" button is checked, the parts of the image that move outside the layer border will turn up on the other side of the image. If you don't want this, you can choose to fill the empty area with the background color or with transparency.
Default Keyboard Shortcut: Shift-Ctrl-O