The article provides an overview of the main directions of the scientific program of the III International Workshop on Modeling, Information Processing and Computing - MIP: Computing-2021, which took place on May 28, 2021 in Krasnoyarsk on the basis of the 2Krasnoyarsk Science and Technology City Hall of the Russian Union of Scientific and Engineering Associations. Provides overview information about the reports that were included in the program of the scientific session of the seminar and presented in the form of online / video reports and presentations of the participants with placement on the website of the conference materials. Information is given about the seminar partner - the service of scientific publications with open access CEUR-WS.org on Sun SITE Central Europe, operating under the auspices of the Technical University in Aachen, Germany (RWTH Aachen University). Proceedings of the MIP: Computing 2021 Seminar are published as articles in English in CEUR Workshop Proceedings, Volume 2899.