Definition:
A "delivery boy" is a noun that refers to a young man or boy who is employed to deliver items, usually packages, food, or other goods, from one place to another.
In more formal or professional contexts, you might refer to a "delivery driver" or "courier," which can include both male and female workers and is often associated with larger vehicles or more serious delivery jobs.
While "delivery boy" primarily refers to someone who delivers goods, the word "delivery" can also relate to the act of giving birth (e.g., "the delivery of the baby") or the way in which someone presents information (e.g., "the delivery of his speech was excellent").
A "delivery boy" is a person, typically a young man, who is responsible for delivering items to customers.