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SPIDERS is the spectroscopic follow-up effort of the Sloan Digital Sky SurveyIV (SDSS-IV) project for the identification of X-ray selected galaxy clusters.We present our catalogue of 2740 visually inspected galaxy clusters as a partof the SDSS Data Release 16 (DR16). Here we detail the target selection, ourmethods for validation of the candidate clusters, performance of the survey,the construction of the final sample, and a full description of what is foundin the catalogue. Of the sample, the median number of members per cluster isapproximately 10, with 818 having 15 or greater. We find that we are capable ofvalidating over 99% of clusters when 5 redshifts are obtained below $z<0.3$ andwhen 9 redshifts are obtained above $z>0.3$. We discuss the improvements ofthis catalogue's identification of cluster using 33,340 redshifts, with $\Deltaz_{\rm{phot}} / \Delta z_{\rm{spec}} \sim 100$, over other photometric andspectroscopic surveys, as well as present an update to previous ($\sigma -L_{X}$) and ($\sigma - \lambda$) relations. Finally, we present ourcosmological constraints derived using the velocity dispersion function.

SPIDERS: An Overview of The Largest Catalogue of Spectroscopically Confirmed X-ray Galaxy Clusters