A lesson is the most complex, and most 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, and you proceed to the next item. Get it wrong, and you're either taken back to the instructional page, or you jump to a remedial page. But the jump question could also easily ask a student what he is interested in learning next, or who her favorite candidate is. Or it could also be labeled Continue to take the student to the next page.
The following is a screenshot of a lesson page...