In English law, a fee simple or fee simple absolute is an estate in land, a form of freehold ownership. A "fee" is a vested, inheritable, present possessory interest in land. A "fee simple" is real property held without limit of time (i.e., permanently) under common law, whereas the highest possible form of ownership is a "fee simple absolute," which is without limitations on the land's use (such as qualifiers or conditions that disallow certain uses of the land or subject the vested interest to termination).
The rights of the fee-simple owner are limited by government powers of taxation, compulsory purchase, police power, and escheat, and may also be limited further by certain encumbrances or conditions in the deed, such as, for example, a condition that required the land to be used as a public park, with a reversion interest in the grantor if the condition fails; this is a fee simple conditional.
The word "fee" is related to the term fief, meaning a feudal landholding. Feudal land tenures existed in several varieties, most of which involved the tenant having to supply some service to his overlord, such as knight-service (military service). If the tenant's overlord was the king, grand serjeanty, then this might require providing many different services, such as providing horses in time of war or acting as the king's ceremonial butler. These fiefs gave rise to a complex relationship between landlord and tenant, involving duties on both sides. For example, in return for receiving his tenant's fealty or homage, the overlord had a duty to protect his tenant. When feudal land tenure was abolished, all fiefs became "simple", without conditions attached to the tenancy.
In English common law, the Crown had radical title or the allodium of all land in England, meaning that it was the ultimate "owner" of all land in the past feudal era. Allodial title is reserved to governments under a civil law structure.
However, the Crown can grant ownership in an abstract entity – called an estate in land – which is what is owned rather than the land it represents.