A more thorough explanation:

Trespass is when someone knowingly enters another person's property or land without permission, which violates the owner's privacy or property rights. There are many laws related to trespass.

Trespass to Land: This occurs when someone physically invades an owner's real property or causes an object or a third person to invade it without permission. The intent to enter or remain on the land is required, regardless of whether the trespasser knows the land is owned by someone else. The owner does not need to prove actual damages, even a nominal damage claim is permissible.

Trespass to Chattels: This occurs when someone intentionally deprives or prevents someone else's right to use their legally possessed personal property. Actual damage is required to cover the cost of repair or loss of rental.

Trespass to Conversion: This is a more serious interference than trespass to chattels. The trespasser totally controls or destroys the chattels, and the possessor's interests are harmed to such an extent that the trespasser may be required to pay the full value of the chattel. Mistakes of ownership or lawfulness of the trespasser's actions cannot be defenses.

Necessity: This is a defense to property torts, but it is not absolute. The defendant is protected by the privilege of private necessity to enter the plaintiff's property if it is necessary to protect themselves, a third person, or their or the third person's property from serious harm, and there is no less-damaging way. The defendant is not liable for any nominal or punitive damages. If there are actual damages, the defendant must pay for the damage they caused.

Liability: A landowner has the privilege to use reasonable force to stop a trespasser's entry onto their land. But if the landowner causes serious injury to the trespasser who does not threaten the landowner with harm, the landowner will be liable for the trespasser's injury. An owner is usually not liable to a trespasser who gets injured on their land, as they have no liability to exercise reasonable care to make their land safe for trespassers. However, there are exceptions, such as if the landowner creates artificial conditions that are highly dangerous to anticipated kids trespassing.

Larceny: Trespass is an element of larceny, which means a defendant unlawfully takes away someone's personal property with the intent of depriving them permanently at the time of taking.

Robbery: Robbery also includes trespassory taking and carrying away someone else's personal property by force or threat of immediate physical harm in that person's presence.

Property: Adverse Possession: To start the statute of limitation period, the possessor should actually trespass. The statute of limitation time period does not stop running until the owner brings a suit for trespass or ejectment, while a temporary reentry by the owner is not enough to stop the statute of limitation from running.

For example, if someone enters their neighbor's backyard without permission and starts using their pool, they are committing trespass to land. If someone takes their friend's bike without permission and damages it, they are committing trespass to chattels. If someone breaks into a store and steals all the merchandise, they are committing larceny, which includes trespass. These examples illustrate how trespass can be intentional and harmful to the owner's property interests.