Subject knowledge refers to the understanding and expertise a person has in a specific area or field. This can include facts, concepts, theories, and practices related to that subject. For example, a teacher with strong subject knowledge in mathematics can effectively explain complex problems and help students grasp essential skills. Having solid subject knowledge is crucial for professionals, educators, and students alike. It enables individuals to engage deeply with their field, make informed decisions, and contribute meaningfully to discussions. In science, for instance, a researcher with extensive subject knowledge can design experiments and interpret data accurately.