What is mass healing word?

Mass Healing Word is a spell in the game Dungeons and Dragons. It is a 3rd level spell in the Cleric class that allows a cleric to heal a group of injured allies within a certain range. The spell's healing effect increases as the cleric's level increases, and it can be cast as a bonus action, meaning that a cleric can still take another action in the same turn. The spell is particularly useful in combat situations where multiple allies have been injured and need quick healing.