Massive stars produce a flood of ultraviolet (UV) photons, radiation pressure, and drive strong winds, which allow them to interact with the surrounding interstellar medium (ISM) and to create H ii regions with surrounding mid-infrared (MIR) bubbles. Observational
studies suggest that the expansion of H ii region triggers the formation of stars in our Galaxy. However, despite of their importance, we do not have much knowledge of the physical processes of their interaction and feedback on the surrounding molecular environment. Several processes, have been proposed for triggering star formation at the peripheries of HII regions. In this talk I will discuss about these processes and present star formation scenario in HII region.