  For almost a century, since Bernal\'s attempts at a molecular theory of
liquid structure(Bernal [1]), correlation functions have been the bridge to
compare theoretical calculations with experimental measurements in the study of
disordered materials. Pair Distribution Functions (g(r)), Radial Distribution
Functions (J(r)), Plane Angle Distributions (g({\theta})) and Coordination
Numbers (nc) have been widely used to characterize amorphous and liquid
materials (Waseda [2]; Elliott [3]; Valladares et al. [4]) and, in particular
Bulk Metallic Glasses (Miller and Liaw [5]; Galv\'an-Col\'in et al. [6]).
Correlation is an Open-Source software designed to analyze liquid structures
and amorphous solids; the software is user-friendly, the modular design makes
it easy to integrate in High-Throughput Computing (HTC) to process structures
with a large number of constituents in a standardized fashion. Correlation is
ready to be used in Windows,Linux and Mac. Currently, we support DMol3 (CAR),
CASTEP (CELL), ONETEP (DAT)and VASP (POSCAR) structure files. The code can
handle up to 25,000 atoms, so it can be used to analyze both classical and
first-principles simulations. At the end, the output of every single
correlation function is exported to the corresponding comma-separated value
file (CSV), to further analyze the results.
