Online help is a form of user assistance that provides topic-oriented, procedural or reference information designed to assist in using a software application, web application or operating system. Online help linked to the application's state (what the user is doing) is called Context-sensitive help.

The help information can be created using help authoring tools or component content management systems and can be delivered in a wide variety of proprietary and open-standard formats. Help of this kind has largely replaced printed documentation.

Interactive help can also be provided via virtual assistants and Chatbot systems.

Microsoft develops platforms for delivering help systems for the Microsoft Windows operating system.