  The high luminosity of massive, early-type stars drives strong stellar winds
through line scattering of the stars continuum radiation. Their momenta
contribute substantially to the dynamics and energetics of the ambient
interstellar medium in galaxies. The detailed multi-wavelength study of massive
O-type and Wolf-Rayet binaries is essential to explore the hydrodynamics of the
shocks formed in the stellar outflows and wind structure. Further, deep
analysis of some of the interesting phenomena like particle acceleration and
dust formation associated with hot stars winds provides a global view of
stellar outflows. In this context, a few massive binaries have been explored
using photometric and spectroscopic measurements in different wavebands. This
paper highlights important insights gained from investigating massive binaries
with several ground and space-based facilities.
