The Visual and Text Editor in WordPress

The Visual Editor
The Visual Editor is the default mode and looks very similar to a word processor. The visual editor icons allow you to format text, change font alignment, insert bulleted and numbered lists, and more.

The Text Editor
The Text Editor has fewer options, but allows you to write your posts in HTML. This editing mode is aimed at users who are comfortable working with HTML. When you need to add some font style, or paste in code from an outside source, you can use the Text editor.

Switching between the Visual and Text editing modes is easy. Just use the tabs directly above the right side of the editing area.

Note:
Switching between Visual and Text view can cause some of your HTML entities to be lost. This is due, in part, to the manner in which TinyMCE handles your HTML. If formatting is very important, do not switch between views. If you’re writing a lot of code, we suggest you remain in the text editor.