<a name="1000582"> </a>A selection marks off areas of the canvas for "special treatment." It can either protect an area from change or designate the area that you want to change.
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<a name="1006125"> </a>You can save selections as alpha channels. This lets you store selections and edit them with brushes and image effects. For more information about alpha channels, refer to <a href="13-Channels3.html#1012691">"Understanding Alpha Channels"</a>.
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<a name="998933"> </a>Having one selection, but multiple channels, is convenient and powerful. It's easy to save selections, then reactivate them later. You can also create a selection from multiple channels by adding, subtracting, or intersecting them.