What does the os manage that ensures enough is allocated to each application being used?

The operating system (OS) manages memory allocation through a component called the memory manager, which oversees how memory is assigned to various applications. It uses techniques like paging and segmentation to divide memory into manageable units, ensuring that each application receives enough memory while preventing conflicts and maximizing efficiency. Additionally, the OS employs algorithms to track memory usage and reclaim unused memory, thereby ensuring fair distribution among running applications.