A Full House is the third best possible hand in the poker hand ranking system. Only a Straight Flush and 4-of-a-Kind rank above it. This makes it a very strong hand in Hold'em and is rarely beat on the river. That said, there are still many hands that rank under it.
Hand
Frequency
Probability
Straight flush (excluding royal flush)
37,260
0.0279%
Four of a kind
224,848
0.168%
Full house
3,473,184
2.60%
Flush (excluding royal flush and straight flush)
4,047,644
3.03%