Gravitational field:

Newton's law can be restated into the format of a gravitational field, which can prove to be a useful means of looking at the situation. Instead of computing the forces between 2 objects every time, we instead say that an object with mass creates a gravitational field around it. The gravitational field can be defined as the force of gravity at a given point divided by the mass of an object at that point, as depicted to the right. We can define a gravitational field as a region in which gravitational force can be experienced. Forces such as gravitational force and electromagnetic force work with "action at a distance". As bodies are not in contact, it is conceptualized that the force is communicated to bodies through a force field, which operates on the entities brought in its region of influence.

Electromagnetic interaction, which also abides inverse square law such as gravitational force, is completely described in the terms of field concept. Particularly we would not conceptualize about physical existence of the gravitational field unless we refer "general relativity".

A body experiences gravitational force in presence of other masses. This fact can be thought to be the result of the process in which the presence of one mass modifies the characteristics of the region around itself. Or we can say that it creates a gravitational field around itself. When another mass enters the region of influence, it experiences gravitational force, which can be given by Newton's law of gravitation Field strength, apart from its interpretation for the action at a distance, is a convenient tool to map a region and to find the force on a body brought in the field. We can measure gravitational force on a body without reference to other body responsible for the gravitational field. The concept of field strength allows us to study gravitational field in terms of the mass of one body and as such relieves us from considering it always in the terms of 2 body system. The effect of one of the two bodies is represented by its gravitational field strength.