  In this article we present both the discrete and the integral form of
Cauchy-Bunyakovsky-Schwarz (CBS) inequality, some important generalizations in
the n-dimensional Euclidean space and in linear subspaces of it, as well as the
strengthened CBS. The last CBS inequality plays an important role in elasticity
problems. A geometrical interpretation and a collection of the most important
proofs of it are, also, presented.
