Final answer:
Sandy has given Jim a license, which is a personal privilege for temporary use of her property without creating any estate in land or a permanent right like an easement.
Step-by-step explanation:
When Sandy tells Jim he can store his camper in her yard for a few weeks without charging rent, she is offering Jim a license. This is a personal privilege that allows Jim to use Sandy's property for a specific, temporary purpose.
By definition, a license does not create any interest in the land and is revocable at will by the property owner — in this case, Sandy. It is important to understand that this is different from an easement, which is a more permanent right to use another's property and is typically attached to the land itself rather than being personal to the individual.