Waste electric and electronic equipment (WEEE) has been a cause of concern in the past decades due to their complex composition, their low recycling rates, and, of course, their increasing volumes. This chapter summarizes the main challenges that have to be faced and the opportunities relying on the proper management of this waste fraction. The current legislations existing globally are stated together with goals for recycling on the different subcategories of WEEE. Then the composition is analyzed for evaluating the potential improvement of the current systems. Finally, a deep literary review on the existing technologies as well as trends of research during the past years is also presented.