computer

A computer is a machine, device which receives input, stores and automatically manipulates data, and provides output in a useful format. The first electronic computers were made in 20th century. They were size of a large room using  high power as much as hundred of modern PC's. The modern PC's are far more better than the first computers.
   Computers has its generation according to its configuration. Vacuum tubes were used in early computers known as 1st generation of computers. Transistors were developed after vacuum tubes for better work known as 2nd  generation. After transistors IC (integrated circuit) was introduced for more reliable, faster and easier work known as 3rd generation. VLSI are used in modern computers which we are using till now known as 4th generation.
    PC (personal computers) is any general purpose computer which size, capabilities, and original sales price make it useful for individuals, and which is intended to be operated directly by an end-user with no intervening computer operator. It may be a desktop computer, a laptop, a tablet PC or handheld PC.
    Now a days, computers are widely used all over the world. It makes our work easier and faster. Every work are done by computers these days and it saves our data and make it secure. Computers are very easy to use with little knowledge and experience. Computers are used in different purpose. Its multitasking function makes it reliable and easy to use.