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What is a pipette?

 A pipette is a device used for measuring and transferring a volume of liquid. It is commonly made of glass.

The bulb pipette is designed to measure and transfer a precise volume of liquid called an aliquot. It consists of a very long thin stem with a bulb in the centre which holds the contents of the liquid.
Bulb pipettes have one hair line graduation mark and deliver one volume of liquid. The amount of liquid delivered depends upon the size of the pipette. Common sizes are 20mL and 25mL.  
The tip of the pipette always has a small volume of liquid after being emptied. This must not be blown out. Bulb pipettes are calibrated to deliver a set volume of liquid when held vertically upright and always have a small amount of liquid at the base.
Graduated pipettes are divided up into mL graduation marks and can deliver various volumes of liquid depending upon the size of the pipette. Common graduated pipettes are 1mL, 5mL, 10mL and 20mL.
While not as precise as the bulb pipette graduated pipettes can however, deliver a range of volumes of liquid. The size depends upon the initial size of the pipette.