You can fight with a weapon in each hand. You can make one extra attack each round with the second weapon.
Prerequisite: Dex 15.
Benefit: Your penalties on attack rolls for fighting with two weapons are reduced. The penalty for your primary hand lessens by 2 and the one for your off hand lessens by 6.
Normal: See Two-Weapon Fighting and the Two-Weapon Fighting Penalties table.
Special: A 2nd-level ranger who has chosen the two-weapon combat style is treated as having Two-Weapon Fighting, even if he does not have the prerequisite for it, but only when he is wearing light or no armor (see the ranger class ability Combat Style).
A fighter may select Two-Weapon Fighting as one of his fighter bonus feats.
Source: Player’s Handbook (version 3.5), page 102.