Not all mice function the same, nor do they use the same mechanical functionality, but all accomplish the same purpose. Many mice have a ball in the bottom section; that ball rolls when the mouse moves. Some mice, such as trackballs, have their ball on top and/or they don't exhibit buttons; you would have to grab the ball to do what you want: 
Many of the new mce don't use a ball at all: they use a type of light beam to provide the same functionality as the ball. Laptop computers - Notebooks - use another process to simulate the mouse. They are usually equipped with a small flat area/surface, or, sometimes, a short stick.
One of the actions you can perform with the mouse is to move it. To do this, if you are using a regular mouse, you can physically but slightly push the mouse on the table. If you are using a trackball, you can roll the ball. If you are using a laptop, you can position a finger on the pad, press and hold the finger, then move the pressed finger.
When the mouse rests on certain items on the desktop or on some buttons of some programs, a short word or sentence appears: that's a tool tip.
One of the actions you can perform with the mouse is to move it. To do this, if you are using a regular mouse, you can physically but slightly push the mouse on the table. If you are using a trackball, you can roll the ball. If you are using a laptop, you can position a finger on the pad, press and hold the finger, then move the pressed finger.
When the mouse rests on certain items on the desktop or on some buttons of some programs, a short word or sentence appears: that's a tool tip.
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