A more thorough explanation:

A drummer is a type of sales representative who travels around taking orders for goods from wholesale merchants to retail dealers. They are also known as traveling salespeople.

• A drummer for a clothing company might travel to different stores and take orders for new inventory.
• A drummer for a toy company might visit toy stores and take orders for the latest toys.

These examples illustrate how a drummer works as a sales representative who travels to different locations to take orders for goods. They act as a middleman between the wholesale merchant and the retail dealer, helping to facilitate the sale of goods.