What are all the different types of bicycles out there?

So many bikes, so many definitions...

Shimano states it best. Check out the links below to learn more about the different types of bikes.

Mountain Bikes (101):
http://bike.shimano.com/publish/content/global_cycle/en/us/index/new_to_cycling/mtb_101.html

Road Bikes (101):
http://bike.shimano.com/publish/content/global_cycle/en/us/index/new_to_cycling/road_101.html

Lifestyle Bikes (101):
http://bike.shimano.com/publish/content/global_cycle/en/us/index/new_to_cycling/lifestyle_101.html