A force field is a region where a body feels a non-contact force

Gravitational Fields & Orbits — AQA A-Level Physics

Key Definition

Force field — A region of space where a body experiences a non-contact force.

Non-contact forces act without physical contact. Gravity, electrostatic attraction, and magnetic attraction are all non-contact forces.
Three types of force field: gravitational (acts on mass), electric (acts on chargeA property of matter that causes it to experience a force in an electromagnetic field. Measured in coulombs (C).), magnetic (acts on moving chargeA property of matter that causes it to experience a force in an electromagnetic field. Measured in coulombs (C).).
The direction of a force field is shown by field lines (lines of force), drawn with arrows.
For a spherical object like a planet, the mass can be treated as a point mass at its centre.