  In this short note, we try to provide the reader with a brief pedagogical
account of some similarities and differences between stochastic and
deterministic processes. A short presentation of some basic notions related to
the mathematical description of stochastic processes is also given. Our main
aim is to illustrate the somehow surprising fact that the gap between the
behaviour of stochastic and deterministic processes might, from a practical
perspective, be much smaller than a priori expected.
