From Terragen Documentation from Planetside Software
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Get function nodes retrieve specific pieces of information about the scene, either from an input shader, or a specific setting. Usually this data is gathered from the current pixel being evaluated/rendered by the render engine.

A shader is a program or set of instructions used in 3D computer graphics to determine the final surface properties of an object or image. This can include arbitrarily complex descriptions of light absorption and diffusion, texture mapping, reflection and refraction, shadowing, surface displacement and post-processing effects. In Terragen 2 shaders are used to construct and modify almost every element of a scene.

A single element of an image which describes values for color and/or intensity, depending on the color system which the image uses. Groups of ordered pixels together form a raster image.