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The purpose of a forcefield is to describe the potential energy surface of entire classes of molecules with reasonable accuracy. In a sense, the forcefield extrapolates from the empirical data of the small set of models used to parameterize it, a larger set of related models. Some forcefields aim for high accuracy for a limited set of elements, thus enabling good predictions of many molecular properties. Others aim for the broadest possible coverage of the periodic table, with necessarily lower accuracy.

Components of a forcefield
The forcefield contains all the necessary elements for calculations of energy and force:

A list of forcefield types
A list of partial charges
Forcefield-typing rules
Functional forms for the components of the energy expression
Parameters for the function terms
For some forcefields, rules for generating parameters that have not been explicitly defined
For some forcefields, a way of assigning functional forms and parameters


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