What is the act of entering onto another person's property without permission called?

The act of entering onto another person's property without permission is known as trespass. Trespassing involves the unlawful presence on someone else's land, which can occur through physical intrusion or even by remaining on the property after being asked to leave. This legal concept protects the rights of property owners to control access to their land.

In contrast, a license refers to permission granted by the owner to enter their property, which is the opposite of trespassing. Unauthorized occupancy can describe situations where someone occupies a property without consent, but it doesn’t specifically indicate the act of entering. Entrapment is a legal term associated with law enforcement and criminal procedures, not with real estate or property rights. Thus, trespass is the precise term for the unwelcome entry onto another's property.