Bloom's taxonomy is a classification system used to define and distinguish different levels of human cognition. It includes three domains: cognitive, affective, and sensory. The cognitive domain involves knowledge and intellectual skills development. It contains six categories ranging from basic recall or knowledge to more complex levels of analysis, synthesis, and evaluation. The affective domain includes how people deal with things emotionally and contains five categories related to attitudes and values. The psychomotor domain includes physical movement, coordination, and motor skills development over seven categories of increasing complexity. Bloom's taxonomy provides a framework for teachers to define and categorize learning objectives and plan curriculum.