Online help is topic, procedural or reference information delivered through computer software. Most Help is designed to give assistance in the use of a software application or operating system, but can also be used to present information on a broad range of subjects.

Online Help is created though help authoring tools. It is delivered in a wide variety of formats, some proprietary and some open-standard, including:

*Adobe Portable Document Format (PDF) *Hypertext Markup Language (HTML) *Microsoft Assistance Markup Language (MAML) *Microsoft WinHelp (.HLP) *Microsoft Compressed HTML Help (.CHM) *Microsoft Help 1.0 and 2.0 (no longer used) *Mac OS X Help (.HELP)

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