Poker players compete against others in an arena where outcomes are determined partly by chance and partly by the quality of decisions made along the way. Improving your strategy leads to a direct uptick in your expected win rate, at least in the long run.
This is completely different to casino games like slots and roulette, which are games of chance played against the house.
Somewhere in the middle, video poker provides a bridge between these two worlds. It is ultimately a game of chance in which the house always has a small edge. Strategy still matters, though.