In Dungeons & Dragons 5th Edition (5e), an attack bonus is a modifier added to attack rolls to determine whether or not an attack hits its target. It is calculated by combining the character’s ability modifier, proficiency bonus, and any other relevant modifiers.
The ability modifier is determined by the character’s ability score in the relevant ability (Strength for melee attacks, Dexterity for ranged attacks, or Intelligence, Wisdom, or Charisma for spell attacks). The proficiency bonus is a bonus granted to characters who are proficient in a particular weapon or skill. Other modifiers can include magical bonuses from items or spells.
