A "mouse click" refers to the action of pressing a button on a computer mouse, typically used to select or interact with items on a screen. This action is fundamental for navigating graphical user interfaces, allowing users to open files, launch applications, and execute commands. There are two main types of mouse clicks: a single click and a double click. A single click usually selects an item, while a double click often opens it. The mouse itself is an input device that translates physical movements into digital actions, enhancing user interaction with computers and software applications like Windows and macOS.