  In $\rm\Lambda$CDM cosmology, Dark Matter (DM) and neutrinos are assumed to
be non-interacting. However, it is possible to have scenarios, where
DM-neutrino interaction may be present, leading to scattering of DM with
neutrinos and annihilation of DM into neutrinos. We investigate the viability
of such scenarios in the light of cosmological data by making use of the Planck
2018 dataset (high-l TT+TE+EE, low-l TT, low-l EE) and constrain these
processes in the light of the same. We also discuss a viable particle DM model
where DM-neutrino interaction is present, and map the constraints obtained to
the parameter space of the model.
