lecture : The Computer   
Computer technology and digital media are present in every aspect of daily living in the workplace, at home, in the classroom, and for entertainment

An electronic device, operating under the control of instructions stored in its memory, that can accept data, process the data according to specified rules, produce results, and stores the results for future use. It has tow components. 

  Hardware – the electronic and mechanical equipment that makes up the computer.

Software – a series of instructions that tells the hardware how to perform tasks.