No-Limit Texas Hold'em, the most popular poker game in the world.
Win the chips in the middle (the pot). You win a hand by having the best five-card hand at the end, or by betting so that everyone else folds.
Each player gets 2 private cards. Up to 5 shared cards are dealt face up in the middle. Make your best 5-card hand from any mix of your 2 cards and the 5 shared cards.
The dealer button moves one seat to the left after every hand, so everyone takes turns paying the blinds.
If you go all-in and others keep betting, you can only win what you matched (the main pot); the extra goes into a side pot between the others.