The aim of this lecture is to introduce Bernoulli’s principle and to derive his formula in terms of conservation of energy. Here also present applications of the Bernoulli principle. By this principle we can understand how does a plane fly; how does a perfume spray work and why does a cricket ball curve. The Bernoulli Equation can be considered to be a statement of the conservation of energy principle appropriate for flowing fluids. The qualitative behavior that is usually labeled with the term “Bernoulli effect” is the lowering of fluid pressure in regions where the flow velocity is increased.