A more thorough explanation:

Term: Angaria
Definition: Angaria is a term that has different meanings depending on the context. In ancient Rome, it referred to a compulsory service where people were required to transport goods or persons for the imperial post. It was like a public Pony Express rider. In history, it also referred to a service that a lord would demand from their subjects beyond what was due. For example, a lord might require a farmer to work on their land for an extra day without pay. The plural form of angaria is angariae.
Examples: In ancient Rome, angaria was used to ensure that important messages and goods were delivered quickly and efficiently. The government could force people to provide this service, which was essential for the functioning of the empire. In medieval Europe, lords would sometimes demand angaria from their subjects as a way to exert their power and extract more labor from them. For example, a lord might require a peasant to work on their land for an extra day without pay. These examples illustrate how angaria was used to compel people to provide services or labor against their will.