What do you mean by real time and real clock?

Real Time Clock usually refers to a hardware IC which is designed to keep time accurately. Dallas semiconductor makes a number of RTCs. If you are really curious, you can download datasheets at...

it is very easy.

It is when people are online at the same time. It is used for communication across the internet between users (usually used for instant messaging). There is little or no delay between broadcast and...

to tell the difference between fake and real things

Real means Royal in Spanish, so for Spanish they support Royal Madrid. Hope this helps.