5,000 Year Journey Of The History and Evolution of Computers, The

A computer is essentially a physical machine or system which can perform predefined actions via receiving input and then outputting useful information/results. For example a modern-day computer can receive input (such as words typed into a word processing software such as Microsoft Word), and then it will process that information and output it in a useful format (i.e. as a document which can then easily be edited and added to).