Documentation

n. use of documents as evidence; collection of documents

In general terms, documentation is any communicable material (such as text, video, audio, etc., or combinations thereof) used to explain some attributes of an object, system or procedure. It is often used to mean engineering or software documentation, which is usually paper books or computer readable files (such as HTML pages) that describe the structure and components, or on the other hand, operation, of a system/product.
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Documentation, n the permanent recording of information properly identified as to time, place, circumstances, and attribution. [more]Documentation - Community and Resources

Noun
1. confirmation that some fact or statement is true
(synonym) certification, corroboration
(hypernym) confirmation
(derivation) document
2. program listings or technical manuals describing the operation and use of programs
(synonym) software documentation
(hypernym) software, software system, software package, package
(derivation) document
3. documentary validation; "his documentation of the results was excellent"; "the strongest support for this this view is the work of Jones"
(synonym) support
(hypernym) validation, proof, substantiation
(derivation) document

n. documentation, use of documents as evidence