A class is a definition, a template or a mould to enable the creation of new objects and is, therefore, a description of the common characteristics of several objects.

Using the concept of class, characteristics can be associated with a whole group of objects. A class can then be described as an abstraction that describes all the common characteristics of the objects forming part of it.

An object that belongs to a class is called an instance of that class.

Figure 1.3. Instances of class Man

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