The KWL chart is an instructional strategy that involves 3 columns: Know, Want to Know, and Learned. It is used before, during, and after a lesson to activate prior knowledge, guide learning goals, and assess understanding. KWL charts can be adapted for any subject area. They help students organize information and involve them in the learning process through critical thinking and self-assessment. However, KWL charts rely on prior knowledge and may not support students with low literacy or vocabulary skills without additional scaffolding techniques from the teacher.