Chunking is dividing information into sections that can carry a meaningful semantic Tag of Metadata (or possibly a style tag).

Chunking divides information into small enough sections that they can be comprehended and remembered easily. A chunk may be the smallest element for indexing.

Another name for a chunk is a Content Component, though this sometimes refers to an element with interactive functionality.

A Content Element may contain a Content Template with smaller chunks. So a chunk or element need not be "atomic," unbreakable into smaller elements.

Chunking is sometimes called segmentation.

RT Content Element