The Layer reference article from the English Wikipedia on 24-Apr-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Layer

A layer is the following:

• In abstraction, a layer is an abstract place conceived as having depth.
• In telecommunications a layer is an F region.
• In telecommunications networks and open systems architecture a layer is a group of related functions that are performed in a given level in a hierarchy of groups of related functions.
• In object-oriented design a layer is a group of classes that have the same set of dependencies, i.e. a collection of reusable components that are available for reuse in similar circumstances.
• 2D_computer_graphics#Layers

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