Open Pair
An open pair is a pair that has been dealt face up, so all players can see it. It is common in stud games.
The simple explanation
In seven-card stud, if your two up cards are the same rank, you have an open pair. The others see it.
A closer look
An open pair gives information: the opponents know that you have at least a pair. It also lets the player bet the big bet on fourth street in fixed-limit stud. Players with an open pair often get action, because the pair is not hidden. Compare with a pair in the hole.
A practical example
In seven-card stud, a player shows K♥ K♦ as his up cards, an open pair.
Full explanation
An open pair is a pair that has been dealt face up, so all players can see it. It is common in stud games.
An open pair is dealt face up.
It is common in stud.
The others can see it.
It allows a big bet on fourth street in limit.