Question

What is the use of cows and Buffaloes

Answer 1

The main use is that we get milk from each of them, (:
And their waste is also used to create manure. :)

Answer 2

Cows & Buffaloes are used for domestic purpose.
They provide milk used for making various dairy products.
They also serve as beef ( provide flesh).
Their excretion is used as manure, a great natural fertilizer for plants.