A more thorough explanation:

Definition: Towage is the act of towing ships and vessels using a small boat called a tug.

Example: When a large ship needs to be moved from one place to another, it may require towage services. A tugboat will attach itself to the ship and pull it along.

Explanation: Towage is a service that is used to move large ships and vessels that cannot move on their own. The tugboat is a small but powerful boat that is used to pull the ship along. This is necessary when the ship needs to be moved to a different location, such as a port or a dock. The tugboat is able to control the movement of the ship and ensure that it arrives safely at its destination.