Think pair share is a cooperative learning strategy where students think independently about a question, then discuss their thoughts in pairs before sharing with the class. It was developed to encourage student participation. Students first think individually, then pair up to discuss their ideas before volunteering to share with the whole group. The teacher's role is as an inquirer, creator, and facilitator who also observes students. Think pair share helps build critical thinking skills, motivates quiet students, and allows the teacher to assess understanding, though good preparation is needed to engage all students and keep discussions on topic.