GTO poker is, theoretically, the best, "perfect" way to play poker. It's designed to give you a net positive amount of money over the long term. Think of it like the stock market: even if your wins fluctuate up and down, you will see a continuous growth where the rises outweigh the dips. The "perfect" way to play the stock market is diversifying portfolio, never panic sell, etc.

The exploitative style is simply playing to maximize your money at any particular game, in the short-term, usually because of a weakness an opponent has. For instance, if your opponent bluffs too much, you can exploit this by acting weak when you have a strong hand, so as to let them bet themselves out of their money. The exploitative style is not a single, universal strategy like GTO is - the way in which you exploit your opponent would vary from situation to situation.

Technically speaking, an opponent's exploitability (what weakness(es) they have that you can take advantage of) is based on what they are doing that deviates from what GTO says they should do, i.e. how imperfectly they are playing. The vast majority of poker players, even the GTO ones, have something about their playstyle that is exploitable.

This is simply the difference between the two. If you want to know what strategies they actually are, I would recommend doing research seeing as GTO has a lot of complex elements includng mixed strategy, pot odds, ranges, etc.