The quest for our understanding of the behaviour of the fundamental constituents of matter have been going on for several centuries. In describing the behaviour of all non-gravitational phenomena in our Nature, the Standard Model (SM) of particle physics is so far the most successful candidate. It is a theory based on the principles of quantum mechanics. Despite its spectacular success, it is quite evident that it is not complete - Nature exhibits phenomena which are not describable through the SM. However, while there exist several indirect shreds of evidence, the lack of direct evidence has led us to examine the SM with an eagle eye. This exploration depends upon our ability to the development of innovative high energy colliders and our capability to perform the precise theoretical calculations. In this colloquium, we will see how the quantity called 'scattering amplitudes' plays an indispensable role in this fascinating journey.