A
lesson is a structured period of time where
learning is intended to occur. It involves one or more
students (also called pupils or learners in some circumstances) being taught by a
teacher or instructor. A lesson may be either one section of a
textbook (which, apart from the printed page, can also include
multimedia) or, more frequently, a short period of time during which learners are taught about a particular subject or taught how to perform a particular activity. Lessons are generally taught in a
classroom but may instead take place in a
situated learning environment.