Shortsword

Proficiency with a shortsword allows you to add your proficiency bonus to the attack roll for any attack you make with it.

Name	Cost	Damage	Weight	Properties
Shortsword	10 gp	1d6 piercing	2 lbs	Finesse, Light

Finesse. When making an attack with a finesse weapon, you use your choice of your Strength or Dexterity modifier for the attack and damage rolls. You must use the same modifier for both rolls.

Light. A light weapon is small and easy to handle, making it ideal for use when fighting with two weapons. See the rules for two-weapon fighting in chapter 9.

Source: Player's Handbook