A "fleet" refers to a group of vehicles, ships, or aircraft that are operated together, often for a specific purpose. For example, a shipping company might have a fleet of cargo ships that transport goods across oceans. Similarly, a city might have a fleet of buses that provide public transportation for its residents. Fleets can vary in size and type, depending on their function. A military fleet, for instance, may consist of naval ships and submarines used for defense and operations. In contrast, a delivery service might operate a fleet of vans to ensure packages reach their destinations efficiently.