HTML Help Workshop is Microsoft’s authoring tool for HTML Help, its standard help system for the Windows platform. You’ll also hear it called simply Microsoft Help.

The CHM format is a Microsoft online extension file for accessing documentation and help files, and the compressed HTML format may hold text, images, tables, and links -- when used legitimately.

The Microsoft HTML Help SDK is used to create online help for a software application or to create content for a multimedia title or Web site.