Computer system consist of hardware components that work together to perform a particular task. Computer Systems are used in many different environments. Each with different purpose and aim. Computer systems are used to reduce the workload and do work effectively. There are many different environments where computer systems are used. Computer systems can work by themselves or access other devices that are external or connected with other computer systems. In modern day’s pen and paper is not effective as a computer which can make the work easier and faster reducing the time and workforce compared to pen and paper. With the new technology computer systems are more reliable, can hold huge amount of information, documents and files can be edited, files and documents can be accessed easily.