What exactly is a "Season Pass" ?

I'm thinking of buying Battlefield 4 Premium from Amazon. You can get it with a "Season Pass" for extra cost. What exactly is a "Season Pass"? Does this mean that you have to keep paying every year or something to play online?

I've been playing the non-premium BF4 online since November without any problems. I have a PS3 and do NOT have a PSN Plus account (just the free account), in case it matters.

Also, what's a good price to purchase the Premium?

http://www.amazon.com/Battlefield-Premium-Season-Pass-Digital/dp/B00GGUUFUI/ref=sr_1_1?ie=UTF8&qid=1396060065&sr=8-1&keywords=battlefield+4+ps3+premium

TIA!

Pretty sure premium gets you early access to DLC and the season pass gets you all the DLC at a slightly reduced cost.

A season pass is just marketing ploy to get you to prepay for DLC that hasnt been released yet, usually cheaper overall than paying for all of them per DLC, usually if they release 4 youd pay for 3 and get one free kinda deal.

Good if you plan to get all the DLC anyways but just another money grab by devs really.

It sucks that not all DLC comes with the battlefield 4 premium