Royal Flush
This is the highest hand in standard Poker and consists of the following cards: A K Q J 10 all of the same suit. 
E.g. or 

4 Aces
This is a hand containing all four aces.
E.g. or 

Straight Flush
This is a combination of five sequential cards all of the same suit.

E.g. or 

Four of Jacks, Queens or Kings
This is a combination of four of the same face cards.
E.g. or 
or 

Four of 2s through to 10s
This is a combination of four of the same cards.
E.g. or 

Full House
This is a combination of three cards of one denomination and two cards of another denomination.
E.g. or 

Flush
Five cards all of the same suit.
E.g. or 

Straight
Five cards in sequence of any suit.
E.g. or 

Three of a Kind
Three cards of the same denomination and two unmatched cards.
E.g. or 

Two Pairs
Two different pairs and any fifth card.
E.g. or 

Jacks or Better
Two faces of the same denomination with no other pair or third matching card.