Final answer:
Persistent Rage is a class feature that grants barbarians in D&D 5th edition the ability to extend their rage beyond the normal duration by taking damage or attacking.
Step-by-step explanation:
Persistent Rage is a class feature that is granted to barbarians in Dungeons & Dragons (D&D) 5th edition. It allows a barbarian to maintain their rage for longer periods of time. Normally, a rage lasts for 1 minute, but with Persistent Rage, a barbarian can extend their rage beyond the normal duration as long as they keep taking damage or attacking. This means that a barbarian can stay in a rage to continue benefiting from its bonuses, such as resistance to damage, advantage on Strength checks and saving throws, and increased damage on their melee attacks.