A rich text editor is an application that provides a user interface with which users can edit text while preserving the formatting of the source. There are many uses for this kind of application, but it is most often used for creating and formatting content.
A rich text editor saves time because it allows writers to create content faster and without having to worry about formatting issues. A rich text editor allows writers to be more efficient because they know their work will be preserved as long as the source document is formatted properly.
Rich text editors allow writers to make edits and changes to their content in real-time. They are quite easy to use and have a lot of features that can help users edit better.