Markup languages use tags to differentiate content from format and appearance control.
Markup languages differ from other languages where the context of the information is dependent upon where in the file the information is stored. Throughout the rest of this course, I will frequently interchange the use of information and content. Content is a particular type of information that is meant to be understood by the user. Content is the words and images displayed to you in your browser. Frequently, it can only be understood in its correct context.