Monk weapons in D&D 5e are simple melee weapons without the two-handed or heavy property, plus shortswords. Monks can use Dexterity instead of Strength for attack and damage rolls with these weapons. Additionally, when using a monk weapon, the monk can make one unarmed strike as a bonus action, allowing for a combination of weapon and unarmed attacks in a single turn. This flexibility lets Monks engage effectively in combat while utilizing their martial arts skills.