Field theory

Field theory is the language of physics. They were introduced by Michael Faraday, a great 19th century British scientist. Faraday would assign a series of numbers, the strength and direction of the force, to a point in this field, to any point in space. The field is a single entity, the totality of these “numbers at any point in space.” 

In other words, the concept of a field, is a collection of numbers defined at every point in space that completely describes a force at that point. 

All of the forces of nature can be expressed as a field. This is why Faraday’s concept is so powerful. We could honestly say that progress of the past 100 years in physics has been the search for the field equations of the forces of nature.