What type of user interface does a smart phone have, GUI, Describe user management, The OS manages a system of authorised user details and allocates certain access rights., What is multi tasking, Running several programs at the same time. A slice of the processor is dedicated to each task, Why does a computer need system software, To interact with the hardware and software of the computer, What is memory management, Data and programs are loaded into memory when needed nad the OS keeps track of where the data is held to avoid over writing it., Name two utility programs, Encryption, compression, firewall, anti-virus, defragmentation and backup,, How can disk defragmentation overcome the issues of a slow computer, Empty spaces are collected together, files are stored next too each other in order and it becomes easier to read the file, What is compression, A reduction in the file size, What does the disk defragmenter do, Puts the fragmented pieces of the file together so they fill up in consecutive locations on the disk . It also puts the remaining empty spaces together, What's the functions of the OS, Provides an interface, user managament, peripheral management, memory management, multi tasks and file management, What is file management, The OS keeping an index of where all files are stored, and where there are blocks of free space

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