Plate Joining Biscuits

What is a Biscuit Joiner used for?
A Biscuit joiner is a woodworking tool used to join two pieces of wood together.

What Types of Joints are Biscuit Joiners used for?
The most common joints are:
Edge to Edge (i.e. table tops), Miter Joints (i.e. picture frames), Butt Joinery (end to end), Corner joints (i.e. drawers), T Joints (i.e. book shelf)

(information provided by woodzone.com)

They said "Butt Joinery." I don't care how "mature" you are...that's funny.