This document provides an overview of several theories of learning, including behaviorism, cognitivism, social learning theory, social constructivism, multiple intelligences theory, and brain-based learning. It defines learning and examines key aspects of each theory, such as behaviorist concepts of classical and operant conditioning, cognitivist ideas of discovery learning and meaningful verbal learning, and social constructivist views of socially constructed knowledge. Critiques of each theory are also mentioned. Theories are compared and examples are given of how each informs classroom instructional practices. Source information is listed at the end.