Alternatively referred to as middle or centre, the center is the position that's horizontally or vertically aligned with the middle of an object. In computing, the term "center" is frequently used to describe text that is horizontally in the middle of a line. However, the term "middle" may describe text that's in the middle of a page both horizontally and vertically. The following example shows text that is centered horizontally.
Example of Centered Text
How to center in a text file
When editing a rich text file in Microsoft Word or another rich text editor, you can usually center text using the keyboard shortcut Ctrl+E. You may also click the center alignment icon, as shown in the picture.