What a computer can do?

Answer 1

A computer can "do" only ONE thing. It can ADD 1's and 0's. Period. no other mathematical function exists for a computer CPU other than the addition of binary numbers. it can add. it ends there. Everything you see, video, printouts, internet... everything is the result of the addition of 1's and 0's. It's really not complicated. In theory, computers can do any "computation" which is a fancy way of saying they can take numerical input, perform mathematical operations on them, and then return numerical output. Of course, people don't like numerical input and output, so we've invented fancy ways to encode things like text and pictures into numbers, so we can have our computers do stuff like spell check and send things over the internet.

Now, to get the subtraction, squaring, multiplication, division - ALL other mathematical functions the computer adds 1's and 0's in creative ways utilizing the Most Significant Bit and the Least Significant Bit (MSB and LSB are the bits at either end of whatever length byte word it's using.

To answer "what can I do with a computer:

A computer can do many things. It can print out documents, it can let you surf the internet, and it can store photos. You can exchange e-mail, listen to music, watch movies or television shows, buy things, browse the web, play games, and a multitude of other things. Most people use computers for word processing (typing and editing stuff), Surfing the internet (getting articles and pictures from other people's computers), and playing games. But, it is all based on 1's and 0's.
They can do math, but that's it. In general, computers process data.

Answer 2

almost any thing

Answer 3

Anything