Apple trees are generated naturally in forests, jungles, and taiga. If you are using an existing world, you will only see apple trees appear in previously unexplored terrain.
Apple trees will shed apples over time, the amount limited to no more than 8 dropped apples underneath an apple tree at any one time. When broken, the leaf blocks of apple trees have a chance of dropping an apple.
To plant an apple tree, you simply plant apple seeds on grass or dirt, a sapling will spring out of the ground where you place the seeds.
Apples restore 2 points of hunger and provide 0.6 nourishment points, they are also used in Fruit Salad.
Cider is made by placing two apples above a glass bottle in the crafting grid.