Computer science

A computer's input refers to a way a computer receives instructions from a user of what to do. Example of a computer input are the pressing of keys on the keyboard, actions of a computer mouse, movements captured by a computer camera. I did not list all of the input options here, simply because there a lot of them, and it would be very difficult to list them all.

There are tree main types of computer software. These types are freeware, shareware and commercial software. Freeware means that you don't have to pay a dime for such software, shareware has a time period when it is possible to use such software, so a person can make a decision whether to buy it or not, commercial software is the software for which a person needs to pay at the time such software is obtained.

A computer's software is invisible portion of a computer. Computer software can be of different kinds, depending what a person is trying to achieve. Computer software can be designed for making fancy textual documents, presentations, databases, coding. I know that I did not provide complete set of software options. There are a lot of software choices and it is impossible to list them all.

A computer hardware is visible portion of a computer. Invisible portion of a computer i called software.

We use the term computer to describe a personal device or a server that can operate with data and can perform math calculations really fast. However term 'computer' did not have same meaning that we have for this word today. Term 'computer' in 1600s was referring to a person, who was doing math calculations well. In 1944 enormous Mark 1 computer was made by British government to crack German secret messages during WWII. In 1945 first programmable computer ENIAC was made. ENIAC was first general purpose computer. Early computers were massive, they could take an entire room. First massive produced computer for general public was Apple II computer. Today there a number of computing devices: desktop computers, laptop computers, tablets, smart phones. They perform a number tasks including running photo editing software, messaging and storing all sort of documents, they perform calculations well. 

Data analysis is a process of retrieving useful facts from the raw data. Data analysis is good to be performed using computers, because computers are good at processing a lot of data.