  A panoramic view is given of the applications of QFT to diverse areas of
physics, beginning with the concepts of QED Vacuum as well as of electron
self-energy and renormalization. The related concepts of the degenerate vacuum,
spontaneous symmetry breaking (SSB)and Nambu-Goldstone bosons, together with
their applications to condensed matter physics and quasi particles are
outlined. The possibilities of application to life sciences are also examined.
Finally the alternative method of Path integrals for introducing QFT is briefly
indicated.
