Teacher tenure is a form of job protection that allows public school teachers to be dismissed only for specific reasons after a certain number of years on the job. While initially intended to protect teachers from arbitrary firing, tenure is now criticized for making it too difficult and costly to remove underperforming teachers. Data shows that teachers have much stronger job security than other professionals like doctors and lawyers. The document argues that tenure should be reformed or eliminated because it often keeps poorly performing teachers in the classroom, hindering students' education, when the primary focus should be on students.