KWL charts are a reading strategy used to help students organize their thoughts before, during, and after reading. It involves three columns - What I Know, What I Want to Know, and What I Learned. This helps students assess their prior knowledge, determine the purpose of reading, and evaluate their comprehension. Variations include adding additional columns. Teachers can use KWL charts to engage students and support those who struggle with reading, memory, or thinking beyond the text. While effective, some students may lose focus or find it difficult with limited prior knowledge.