What it looks like.

A Think-Pair-Share involves students having individual "think time" about some topic or question, then they may discuss with a partner, and finally partners share their thoughts with the entire class.

M10-C Think-Pair-Share Example:
I presented the "What do you see?" slide below and asked my Math 10-C class to come up with as many mathematical things as they could.  
We did a Think-Pair-Share and the combined results of our class brainstorming are shown below. 

     

I had taught my class how to solve a system of linear equations graphically but we hadn't discussed the possible number of solutions to a system.
This Think-Pair-Share served as a great warmup to this topic and tied in nicely with the rest of the lesson.