A bonus action is a term used in D&D 5e for a quick action that can be taken along side a regular action. The timing and distinction is usually only important during combat, where timing is tracked more closely.

A bonus action is a term used in D&D 5e for a quick action that can be taken along side a regular action. The timing and distinction is usually only important during combat, where timing is tracked more closely. A bonus action is considered a type of action, but you can take only one bonus action on your turn

For more, see the section of the basic rules as detailed in D&DBeyond: https://www.dndbeyond.com/sources/basic-rules/combat#BonusActions