Do computers understands english or chinese eor any other langage?

Computers do not actually understand any traditional language, and as has already been posted they work basically from binary input. Of course the input system has become far more complex than the basic ones and zeroes that were originally used, but that is still the ultimate basis behind the operation. Unicode is not an input language but more of an interpretation language for computers.

The Guy above is very correct. Computers understand only binary language, its just "off" or "on" (0 or 1) for them. Everything else is just like a cover to make the user easy working with it, else you would take ages to understand this web page if presented in terms of 0s and 1s to you . UNICODE is a character set which has been developed to work with the computers. It includes symbols from around the world to make working on computers uniform globally. Earlier, the 128 character set called ASCII was used. But to remind you, these are just a cover to traditional binary language because binary is the only language that computer understands.

Computers don't understand anything. They understand only binary, and are programmed to show languages according to their program. So really there is no limit to what language they can display or accept input in, in the end it is translated into simple ones and zeroes.