A comprehensive survey review of new and noteworthy developments of 2D correlation spectroscopy (2DCOS) and its applications for the last two years is compiled. This review covers not only journal articles and book chapters but also books, proceedings, and review articles published on 2DCOS, numerous significant new concepts of 2DCOS, patents and publication trends. Noteworthy experimental practices in the field of 2DCOS, including types of analytical probes employed, various perturbation methods used in experiments, and pertinent examples of fundamental and practical applications, are also reviewed. Display omitted •Comprehensive survey on new and noteworthy developments and experimental practices in 2D correlation spectroscopy.•2D codistribution spectroscopy, scaling MW2D, projection MW2D, 2D heteronuclear correlation NMR spectra, pre-modeling analysis method.•Probes, like IR, Raman, NIR, fluorescence, NMR, X-ray, Mass spectrometry, etc.•Perturbation methods, like temperature, time, concentration, pH, etc., fields of applications, and types of analytical probes.•Applications, like polymers, proteins, composites, solution mixtures, etc.