what is difference between a layer and a mask?

It seems to me they carry same
function to isolate image components
from each other.
Thanks.
Sean
yliu8Asked:
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weedConnect With a Mentor Commented:
Masks are used as either methods for editing selections, hiding portions of images, making selections, saving selections. Layers are used for arranging your final image.
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KimdaCommented:
Masks are used more as a selection tool.
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cevrCommented:
A mask is used to effect something (i.e, another layer) in your picture. A layer is to add something to your picture.
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weedCommented:
Except layers can effect eachother.
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