There are 2 basic categories of trees: deciduous and evergreen. While evergreen trees keep their leaves throughout the year (are ever green!), deciduous trees are the ones that lose their leaves for a part of the year, and then regrow new ones during the next season.
So what about pears? Are pear trees deciduous?
For the most part, yes they are!
Most pear trees lose their leaves during the winter season, and begin to grow new leaves when spring arrives. However, there are some species of pear native to southeast Asia that are evergreen, and keep their leaves all year.