What is the ranking of a straight in poker, and how does the highest straight compare to other hands in the game?

In Poker, a straight is a hand where the cards are in sequential order, such as 5-6-7-8-9. A straight ranks higher than three of a kind and lower than a flush. The highest straight possible is a Royal Flush, which is a straight from 10 to Ace of the same suit and is the highest-ranking hand in poker.