  With the theory of general relativity, Einstein abolished the interpretation
of gravitation as a force and associated it to the curvature of spacetime.
Tensorial calculus and differential geometry are the mathematical resources
necessary to study the spacetime manifold in the context of Einstein's theory.
In 1961, Tullio Regge published a work on which he uses the old idea of
triangulation of surfaces aiming the description of curvature, and, therefore,
gravitation, through the use of discrete calculus. In this paper, we approach
Regge Calculus pedagogically, as well as the main results towards a discretized
version of Einstein's theory of gravitation.
