Final answer:
Easements are rights to use another person's property for specific purposes. They are different from liens, and easements can be classified as appurtenant or in gross. Appurtenant easements can be obtained by necessity.
Step-by-step explanation:
An easement is a right to use the property of another for particular purposes. It is not the same as a lien, which is a claim against a property to secure payment of a debt. Easements can be classified as appurtenant or in gross. Appurtenant easements are attached to the ownership of a particular parcel of land, while easements in gross are not tied to any specific property. One method of obtaining an appurtenant easement is by necessity, when a property is landlocked and requires access through another property.