Think-pair-share is a collaborative teaching strategy. In think-pair-share strategy the teacher acts as a facilitator, and poses a question or a problem to the students. The students are given sufficient time to think and gather their thoughts, after which the teacher asks them to pair themselves and share their thoughts with each other. As the students begin to share their thoughts and views, each learns to see the different perspective of thinking among their peers. By doing so the students learning is enhanced by the formation and articulation of an idea. This also enables the students to have clarity of thought and have the ability to communicate their thoughts and ideas to another student.
Source : https://en.wikipedia.org