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In this talk, I will derive a continuity in the outer layers of Hydrogen/Helium in a group of stripped envelope supernovae (SNe) which loose their outer envelope and a group of interacting SNe which gain their outer envelope through interaction with a nearby circumstellar medium (CSM). Through our long term observing campaigns, we have studied few representative members of these subclasses indicating that the members are not really distinct but are linked by a continuum of outer envelope. We used the probe of light curve modelling to estimate the physical parameters associated with the explosions like the Ni-mass, ejecta mass and energies of the explosions of these SNe while spectral modelling helped to constrain the spectral parameters like elemental abundances and velocities. For the interacting SNe, modelling also helped us to infer the CSM mass, radius and geometry. Along with probing the progenitor scenarios and mass-loss history of these events which are highly debated, we have now investigated some new objects which highlight the fact that these members are not really distinct and are divided based on the outer continuum layer. Currently, big telescopes with larger diameters will help to see whether stripped envelope supernovae can become interacting on a longer time scale. Also, a more robust search will help to find such transitioning members and thereby probing their progenitor systems.