Why do pear trees produce pears?

Pyrus is the botanical name for a popular group of deciduous trees that produce fruit known as 'Pears.' The English Word 'Pear' derives from its botanical name Pyrus which is Latin. Most pears that we enjoy today are a species of a larger genus and are known as Pyrus Communis, also Latin. Bartlett, Bosc and Comice are examples of Pyrus Communis.