Does anybody know how a capture card looks like and where can i buy one?

well first you have to decide if you want an internal capture card or external, internal will be attached to your computer and be hooked up to the motherboard inside of the computer, external will most likely have a usb cable that will plug into your computer. both will have inputs for video and audio depending on the type you buy. you can buy them at mostly any major electronics retailer such as best buy, circuit city, etc..

what they look like:

internal:

http://img120.imageshack.us/img120/7306/150mcehv6....

external:

http://images.tigerdirect.com/skuimages/large/P121...

either will cost you around $80US depending on the brand