Transfer of learning involves applying knowledge gained in one context to another context. It is important for students' cognitive development but does not always occur naturally. There are several ways to promote positive transfer, including emphasizing similarities between contexts, teaching critical attributes, and allowing students to generate their own examples. Positive transfer occurs when students can apply past learning to new situations, while negative transfer happens when students incorrectly see similarities between unrelated concepts. Teachers should teach related concepts separately and emphasize differences initially to promote effective transfer of learning.