You can inspire others through stirring words or music. To do so you use a bonus action on your turn to choose one creature other than yourself within 60 feet of you who can hear you. The creature gains one Bardic Inspiration die, a d6.
Once within the next ten minutes, the creature can roll the die and add the number rolled to one ability check, attack roll or saving throw it makes. The creature can wait until after it rolls the d20 before deciding to use the Bardic Inspiration die, BUT must decide before the DM says whether the roll succeeds or fails. Once the Bardic Inspiration die is rolled, it is lost. A creature can have only one Bardic Inspiration die at a time.
You can use soothing music or oration to help revitalize your wounded allies during a short rest. If you or any friendly creatures who can hear your performance regain hit points at the end of the short rest, each of those creatures regains an extra 1d6 hit points.
The extra hit points increase when you reach certain Bard levels: 1d8 at 9th level, 1d10 at 13th level, and 1d12 at 17th level