Texas Hold-Em
Each player is dealt two down-cards followed by an immediate round of betting. Next, three cards are dealt face up in the center of the table. These are known as the flop and belong to every player. Another betting round follows. Next, a fourth up-card is dealt, followed by another betting round; and then a fifth up-card, followed by a final betting round. Each player makes his hand from his two cards plus the five in the center.
The Rainbow also spreads $4x$8 Omaha Hi-low split.