What is the difference between formative and summative assessment?
Formative assessment happens during learning and is used to adjust teaching. It is low stakes and frequent: questioning, mini whiteboards, exit tickets, quick quizzes and peer feedback. Its purpose is to find out what students understand right now so I can reteach, regroup or move on.
Summative assessment happens at the end of a unit or course and judges achievement against standards. It is higher stakes: a final exam, a project, an essay or a practical. Its purpose is to certify and report.
They are complementary, not opposing. Good formative assessment means fewer surprises at summative time, because I have already closed gaps. I also use summative results formatively, by analysing which questions the class missed and reteaching the underlying concept.
The key distinction is purpose, not the format. The same quiz can be formative if I use it to guide the next lesson.