Emotions play an important role in the process of decision-making, as proven in the researches analysed later in this study; furthermore, strategically designed multimedia environments can enhance and influence the user's experience and overall behaviour. This work will focus on these assumptions to analyse the relation between design and emotions and the effects over the human mind of specific media, particularly websites. The objective is to explore the field of emotions and affective computing and to apply these principles to the design of visual media, websites in particular.