From lowest to highest they are:
- High card
- A pair
- Two pair
- Three of a kind
- Straight
- Flush
- Full house
- Four of a kind
- Straight flush
- Royal flush
You can find all the 10 rankings, with examples and odds, in the related links.
Note: When playing with "Wild Cards" the highest possible hand is 5 of a kind, which beats the Royal Fluh.