Weapon Focus( Player's Handbook v.3.5, p. 102)
[Fighter Bonus Feat, General]
Choose one type of weapon, such as greataxe. You can also choose unarmed strike or grapple (or ray, if you are a spellcaster) as your weapon for purposes of this feat. You are especially good at using this weapon. (If you have chosen ray, you are especially good with rays, such as the one produced by the ray of frost spell.)
base attack bonus +1, Proficiency with selected weapon,
Anvil of Thunder (CW) , Anvil of Thunder (CW) , Axespike (RS) , Bear Fang (CW) , Bear Fang (CW) , Blood-Spiked Charger (PH2) , Blood-Spiked Charger (PH2) , Crescent Moon (CW) , Crescent Moon (CW) , Dire Flail Smash (CR) , Flensing Strike (ECS) , Greater Power Specialization (XPH) , Hammer's Edge (CW) , Hammer's Edge (CW) , High Sword Low Axe (CW) , High Sword Low Axe (CW) , Lightning Mace (CW) , Net and Trident (CW) , Overwhelming Critical (DMG) , Power Penetration (XPH) , Power Specialization (XPH) , Powerful Bite (LoM) , Quick Staff (CW) , Ranged Recall (CM) , Ranged Spell Specialization (CAr) , Reach Bite (LoM) , Serpent Strike (ECS) , Shield of Blades (PE) , Spinning Halberd (CW) , Sudden Willow Strike (PE) , Three Mountains (CW) , Touch Spell Specialization (CAr) , Turtle Dart (RS) , Whirling Steel Strike (ECS) , Double Steel Strike (ECS) , Sanctify Martial Strike (BE) , Crossbow Sniper (PH2) , Overwhelming Critical (EL) , Devastating Critical (EL) , Melee Weapon Mastery (PH2) ,
You gain a +1 bonus on all attack rolls you make using the selected weapon.
You can gain this feat multiple times. Its effects do not stack. Each time you take the feat, it applies to a new type of weapon. A fighter may select Weapon Focus as one of his fighter bonus feats (see page 38). He must have Weapon Focus with a weapon to gain the Weapon Specialization feat for that weapon.