Trespass is defined by the act of knowingly entering another person’s property without permission.
For the definition of trespass, the "knowingly entering" requirement refers to the actor's knowledge of the literal act of entering property. It does not matter whether the actor actually knows the property belongs to someone else.
Trespass exists in both tort law and criminal law.
In a tort action, the plaintiff must prove that the offender had, but knowingly violated, a legal duty to respect another person’s right to property, which resulted in direct injury or loss to the plaintiff.
In tort law, trespass is held to infringe upon a property owner’s legal right to enjoy the benefits of ownership. Criminal charges, which range from violation to felony, may be brought against someone who interferes with another person’s legal property rights.