Selecting the parts of images to edit is an important step in modifying images. After you create a selection, you can edit it while leaving the rest of the image unchanged. You can use tools (such as painting or drawing) or apply commands (such as flipping, copying, or cropping) to the selection.
The border of a selection is identified by black and white dashes called a marquee.
Converting a Selection into a Layer
Creating Custom Patterns from Selections
Clipping a Selection to the Canvas