Teach is a verb meaning to show, explain, instruct and generally impart knowledge to someone. Teaching can occur in a formal setting such as a lecture class, or in a casual exchange between a father and son, perhaps as they repair a car or fish off a pier.


In a classroom, students may be asked to show how they solved a math problem. Teachers may show students how to use microscopes correctly. The word show can be used as a verb or as a noun.