The Move Tool is used to move layers or selections.
The Move Tool can be called in the following order, from the image-menu:
/ / .
The Tool can also be called by clicking the tool icon:
The m key will change the active tool to Move.
Holding Ctrl will ensure that the layer to be moved is the current active layer.
Holding Alt will change the Move Mode such that selections can be moved without altering your image.
Options
The available tool options for Move can be found by double clicking
the Move Tool icon.
The Move Tool Toggle switches between moving the current layer and moving the first layer with non-transparent pixels underneath the mouse pointer.
When moving selections, the Move Mode comes in to play. The Move Pixels option will move the contents of the selection whereas Move Selection Outline will move the actual selection.