When was the first computer built?
It was built in 1944.
Is it the same as the computers that we use now?
No, it was as large as a room and worked very slow.
But computers have become smaller, and worked faster now.
Yes. Most computers are as small as a TV set. Some can be made smaller than a book.
Why is a computer so useful?
It can keep much information and work very fast.
Then they can do a lot of work for us.
You are right. They have greatly changed our lives.