What Does Mouseover Mean?

A mouseover is an event that occurs in a Graphical User Interface (GUI) when the mouse pointer is moved over an object on the screen such as an icon, a button, text box, or even the edge of a window. In some instances, the object responds to the mouseover by performing some kind of action or displays a tooltip containing a short description of the object.

Techopedia Explains Mouseover

The response of an object to a mouseover event will depend on what the developer of the application specifies in the object’s corresponding event handler. To see how a link on this page responds to a mouseover event, move your mouse pointer over a link. In most cases, the underlying URL of the link will be displayed on the browser’s status bar.