Proof of neutrino masses and mixing from a series of outstanding experimental efforts have opened a window to physics beyond the standard model of particle physics. There must be an underlying theory which explains the very particular neutrino mass differences and mixing. The Seesaw mechanism has been successful in explaining the smallness of neutrino mass. In this talk, I will discuss the different variation of seesaw models, and their detection prospects at collider experiments. I will also highlight the other non-collider detection modes for the seesaw models.