kitcik
Adventurer
Also TWF offhand attack is in same standard action as primary attack.
Or not...
Using a weapon in each hand.
This option requires you to use two weapons, both of which you can wield in one hand (but read on). It's usually best to use a light weapon in your off hand, but not necessary. You can use an unarmed strike as either your primary or secondary weapon.
When fighting with two weapons, you gain one extra attack with your off-hand weapon when you use the full attack action. If you have a high base attack bonus, you gain iterative attacks only with your primary weapon.
When using a weapon in each hand, you usually can't use a shield, which hurts your Armor Class. In addition, you take an attack penalty on attacks you make with your primary hand and (generally) a bigger attack penalty for your off hand. The exact penalties depend on what feats you have and which two weapons you're using; see page 160 in the Player's Handbook. Parts Two and Three also examine two-weapon fighting in detail.
You get your full Strength bonus on damage rolls for your primary weapon and half your Strength bonus on damage rolls with your off-hand weapon. Other damage bonuses or extra damage, such as from the Weapon Specialization feat or a class feature such as sneak attack, applies in full to both the primary and the off hand.