A computer is basically a machine which is able to execute certain sequences of mathematical or logical operations automatically by the use of memory. Modern computers are able to do broad spectrum of tasks including calculations, visual processing, language processing, etc. These tasks are performed by the central processing units of the computer. The memory of a computer stores instructions which are executed by the CPU. Modern computers can also perform general sets of common activities such as visual processing, arithmetic, etc.
Earlier computers used a main frame computer to operate all its functions. However, with the progress in technology, many changes have been seen in the type of computers. Main frame computers are now replaced with small computers which are still maintained on a main frame. These small computers are called microcomputers.
Larger microcomputers called mainframes are much more expensive than the small ones. This is because main frames are mainly used for storing and processing large amounts of data which are retrieved from the various computers. Large amount of memory and fast speed are the two main factors which have helped in the increase in the size of mainframe computers. On the other hand, microcomputers are fast, have large memory and require low amounts of space.
Another major difference between a computer and a server is the storage capacity. A computer stores the data which is used by a user to run applications. In case of a server, all the files are stored on a remote server and can be accessed by any user who connects using any application. A computer serves to store data. Users access the data stored in the computer through a network or a local area network (LAN).
A computer has many different uses. The main purpose of a computer is to store data in the form of files and retrieve them in the form of information. As more data is stored in a computer, the memory of the computer becomes available for more uses. As long as the computer has a continuous source of power, it can continue working even when the power is cut.
It was once believed that computers are obsolete now. With Internet usage increasing, more people are using the Internet instead of going to a book store to buy a book. There are now websites which can help a person in getting his books delivered to a doorstep. Also, people have become used to surfing the Internet and do their shopping online. Thus, computers have become an important part of our lives and no one can deny the importance of the computer.