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In the real world, you'll often find many individual objects all of the same kind. There may be thousands of other bicycles in existence, all of the same make and model. Each bicycle was built from the same set of blueprints and therefore contains the same components. In object-oriented terms, we say that your bicycle is an instance of the class of objects known as bicycles. A class is the blueprint from which individual objects are created.
According to Google :
What is a Class:
A set or category of things having some property or attribute in common and differentiated from others by kind, type, or quality. "the accommodations were good for a hotel of this class"