What is the Difference Between 3 Port and 4 Port Hdmi?

My dad is looking to buy a new tv, and while I know most the stuff about lcd, plasma, and led terms, I don't know what's the deal w/ 4 port hdmi, can someone give me a little detail about what the difference is, and if its actually significant or if it's something arbitrary like 60 hz vs 200 hz

Suggestion:

It just means that there are 3 or 4 HDMI ports.

These are where you plug in the HDMI cables from your BLuRay player, digital cable, or game console.

It is only significant if you have 4 HDMI devices that you want to plug in.