In mathematics, support refers to the points that have any contribution to a function or a set. Imagine you have a puzzle with different pieces. The support of a function or a set is like the corners and edges of the puzzle, which are crucial for completing it. If you remove any of the important edges or corners, the puzzle will either be incomplete or not make sense. In the same way, the support of a function or a set is important for helping to define what the function or set is and how it behaves. It's like the foundation of a building, helping to hold everything in place and making sure it remains stable.