Central processing unit - like the "brain" of the computer
Contains the data the user has created using a program file
Contains the instructions to run the software and create the data file. Also called and application
Interactive operating system
The computer system reacts to user requests immediately and processes the necessary data
this operating system reacts to the user's input immediately and updates the system straight away. Used eg for on-line shopping, banking, booking hotels or flights
Human computer interface - the way the user and teh computer communicate
Allows user to create files, store them in directories, and control access to these files. IT remembers where files have been stored
Ensure there is enough memory to store files. Loads files into the computers memory
If something goes wrong the user will be given a message to inform them.
These are needed to allow computers to communicate effectively with the peripherals
hierarchical filing system
A filing system where a root directory contains sub-directories which themselves can contain further sub-directories and so on.
Data must be accessed in the order it was created
Data can be accessed in any order