The discovery of the Higgs boson at the Large Hadron Collider (LHC) has experimen-tally proven that charged fermions and gauge bosons get masses after spontaneous breaking of electroweak symmetry. However, one of the key questions that still remains unexplained is the origin of light neutrino masses and mixings. A number of neutrino oscillation experiments have observed non-zero solar and atmospheric neutrino mass splittings. Which implies that neutrinos have tinny but non-zero mass. Seesaw mechanism is one the profound theory to explain the smallness of neutrino mass. In this talk I will discuss about different types of seesaw model. Mainly I will focus on Type-II seesaw model and collider searches of charged scalars in this model.