Layer

A layer is the following:

A layer can be a clonal offspring in the plant nursery business, produced by a reproductive technique known as layering.
Dual layer recording for DVD
Layers in 2D computer graphics
In abstraction, a layer is an abstract place conceived as having depth.
In archaeology, a layer is a body of soil-material, often containing artefacts, deposited at the same time. See stratigraphy.
In computer programming a layer is (also) an abstraction of the type of a stack frame of a run-time call stack of a thread.
In object-oriented design a layer is a group of classes that have the same set of (link-time) module dependencies to other modules, i.e. a collection of reusable components that are available for reuse in similar circumstances.
In Submarine Warfare it refers to thermocline.
In telecommunications a layer is an F region.
In telecommunications networks and open systems architecture (for example, the OSI model) a layer is a group of related functions that are performed in a given level in a hierarchy of groups of related functions.
In web design, <layer> was a <div>-like tag, unique to Netscape browsers. It has been deprecated and fallen out of use.
Layer de la Haye is a village in Essex, United Kingdom.

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