(1) A blockchain level. See
chain and
blockchain.
(2) One of seven levels of processing in a network protocol. See
OSI model.
(3) A tier. Layers tend to refer to software that comprise a hierarchy of code, each layer communicating with the one above or below it.
(4) One of several "drawing boards" or "canvasses" for creating elements in a picture. See
layers and
flatten layers.