What is Pushbutton?
Pushbutton meaning Pushbuttons are screen-based controls that contain a text label or an image (or both). Pushbuttons are used to provide quick and convenient access to frequently-used actions. The pushbutton control is always activated with a single click of a mouse button. Clicking on pushbuttons should cause the indicated action to take place, i.e., "search." Do not use pushbuttons to move from one location to another in a Web site.
reference: Usability.gov – Glossary