The term "central" or "core" refers to the most important or fundamental part of something. In various contexts, it can describe the main area of focus, such as the central nervous system in biology, which controls bodily functions, or the core curriculum in education, which includes essential subjects that all students must learn. In a geographical context, "central" can refer to a location that is in the middle of a region, such as a central city that serves as a hub for economic and cultural activities. This central position often makes it a focal point for transportation, commerce, and social interactions.