  We revise the basic concepts beneath the idea of \textit{superparamagnetism}
and the suitability of Monte Carlo (MC) simulations to study superparamagnetic
(SPM) properties. Starting with the description of the characteristic features
of the single-domain SPM entities, their general magnetic-field and
temperature-dependent magnetic properties are discussed. Then, the use of a MC
technique for studying SPM properties is presented, starting with a general
approach to MC methods and introducing the Metropolis algorithm as an adequate
tool for reproducing SPM features. Special attention is paid to the role played
by the \textit{computational time} MC steps on the simulations.
