The approaches used for modelling heating of non-evaporating dropletsNon-evaporating droplets, and evaporation of mono- andMulti-component multicomponent, are described. It is pointed out that the assumption of infinitely large droplet thermal conductivityThermal conductivity, widely used in modelling of their heating, is applicable only when the characteristic timeCharacteristic time of the process is much longer than the droplet radius squared divided by the droplet thermal diffusivityThermal diffusivity. If this condition is not satisfied, then the heat transfer process inside the droplet needs to be considered. Approximations of the dependencies of the droplet Nusselt number on the Reynolds and Prandtl numbersPrandtl number are discussed. The concept of the effectiveThermal conductivity thermal conductivityEffective Thermal Conductivity (ETC) model is presented. The droplet evaporation processEvaporation process is described by the Maxwell equationMaxwell equation when this process is driven mainly by the diffusion of fuel vapour in air. The equations describing the evaporation process, considering the convection of vapour and air from the surface of the droplet alongside the diffusion of vapour, are presented. The concept of the \(d^2\) -model-model is described. One of the key contributors to the evaporation of multicomponentMulti-component droplets is shown to be the diffusion of components in the liquid phase. The concepts of puffingPuffing and micro-explosionMicro-explosion in composite dropletsComposite droplets are described.