Yes, but you may need an adaptor.
It does everything any other computer will do.
You can not legally run Mac OS on any computer not designed by apple.
Just like you would use any other computer.
The same thing any other computer was used for.
Turn it on by pushing the power button on the back left bottom of the iMac.
There are apps that will only work with Mac OS X which can be on any Mac computer - iMac, MacBook, Mac Mini etc.
The same uses of any Windows desktop computer on the market today.
Sure, just copy them to a CD or Flash Drive.
The iMac is an all-in-one computer. It is well-built, reliable, and dependable. The iMac does what any computer should do it just works. There is rarely a crash and rarely a glitch with a Macintosh computer. You also do not need to run security software on OSx.
Unfortunately the iMac does not have any built-in video inputs. A company named Elgato makes something called the eyeTV which can be used to connect video inputs to any Mac, but there is a bit of lag associated with this configuration.
The iMac G3 is a computer produced by Apple Inc. The iMac G3 was first released August 15th, 1998, and was discontinued on March 18th, 2003. The iMac was released in Bondi blue, as well as a number or other colors.
No, just about any keyboard will work with a Mac.