A Lesson is a complex and powerful, type of activity. Essentially, a Lesson is a series of web pages that presents information and questions.
A Moodle lesson can be a powerful combination of instruction and assessment. Lessons offer the flexibility of a web page, the interactivity of a quiz, and branching capabilities.
A lesson consists of a series of web pages. Usually, a lesson page contains some instructional material, and a jump question about the material the student just viewed. The jump question is used to test a student's understanding of the material. Get it right, you then proceed to the next item. Get it wrong, you're then taken back either to the instructional page or jump to a remedial page. But the jump question could just as easily ask a student what he/she is interested in learning next, or who his/her favorite candidate is, or be labeled Continue and take the student to the next page.