What Does Highlight Mean?
Highlight refers to the action or process of making an object stand out from the rest of the objects on the display screen. The highlighted objects could be a selected block of text, menu options or command buttons. The objects are usually highlighted when they are selected by a combination of mouse clicks or keyboard buttons. The highlighted objects appear more prominent than the rest of the objects.
Techopedia Explains Highlight
Highlight refers to the indication that a particular block of text or object(s) have been selected with the mouse or keyboard. The objects are selected using the mouse by holding down the left button and then dragging the mouse pointer over the area to be selected. For selecting using a keyboard, a combination of shift and arrow keys or certain other key combinations like ctrl+A are also used.