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A Generalization is used to indicate inheritance. Drawn from the specific classifier to a general classifier, the generalization's implication is that the source inherits the target's characteristics. It is used typically in Class, Component, Object, Package, Use Case and Requirements diagrams.
You can also define template binding parameters for a Generalize connector between a binding Class and a parameterized Class.
OMG UML Specification:
The OMG UML specification (UML Superstructure Specification, v2.1.1, p.73) states:
A generalization is a taxonomic relationship between a more general classifier and a more specific classifier. Each instance of the specific classifier is also an indirect instance of the general classifier. Thus, the specific classifier inherits the features of the more general classifier.