It's a linear array that maps addresses to words of data. Attributes of memory include the size of the smallest and largest addressible units of data.
Memory is part of the storage heirarchy.
They are frequently have associated controllers. Resources Collectively, these are the resources that an operating sytem manages. It must allocate space and time on these devices, including the CPU and memory, for the computer to do useful things for people. The layout of the course will largely follow these resources from the CPU out to the peripherals. Virtual Machines Virtual machines insulate many users from each other or one user from many types of hardware.