A barrier is an object or structure that prevents movement or access. It can be physical, like a wall or fence, or abstract, such as a language barrier that hinders communication. Barriers serve various purposes, including safety, privacy, and control of movement. In many contexts, barriers can also represent challenges or obstacles. For example, in sports, a hurdle is a type of barrier that athletes must overcome. In social settings, barriers can affect relationships and interactions, making it important to find ways to break them down for better understanding and cooperation.