Soft-QCD and diffractive processes with CMS and TOTEM

At collider experiments, forward detectors with their kinematical acceptance allow for dedicated physics measurements. The recent measurements on soft QCD and diffractive processes performed with the CMS and TOTEM experiments are presented. The results are compared to theoretical predictions implemented in various Monte Carlo simulations as well as other measurements. These studies are useful to test predictions based on perturbative and non-perturbative QCD techniques and provide valuable inputs for tuning of Monte Carlo event generators\footnote{Published in PoS \\ DOI: https://doi.org/10.22323/1.382.0149}.