Function
A mechanical mouse consists of two rollers in contact with a ball located inside an object the user can slide over a flat surface. The rollers are at 90 degrees to each other and connected to slotted wheels. As the mouse slides, the ball rotates the rollers, causing the slots in their attached wheels to interrupt infrared light sources, thus giving the computer a way to interpret the motion and move the cursor accordingly.
A computer mouse has many functions that help a user use their computer. Below are the most common functions of a mouse.
Move the mouse cursor - The primary use of a computer mouse is to move the mouse cursor on the screen.
Open or execute a program - Once you've moved the mouse to an icon, folder, or other object clicking or double clicking that object opens the document or executes the program.
Select - A mouse also allows you to select a file or highlight and select multiple files at once.
Scroll - When working with a long document or viewing a long web page you may need to scroll up or down on that page. Using a mouse wheel or clicking and dragging the scroll bar is another function of the mouse.