Emotional intelligence (EI), in just thirty years of scientific development (Salovey and Mayer, 1990), has gone from being a fashionable concept to an exciting and fruitful field of work. Although sometimes at odds, the different theoretical and assessment approaches, as well as the possible implications of the construct in areas of people's life functioning (e.g., health, education, work, family...), have become clear triggers of interest in the study of EI. In this sense, several authors argue that the skills to identify, assimilate, understand and regulate our emotions and those of others are potential resources that would facilitate better coping with stressful events. In this paper, we will present a review of some of the most interesting findings in the field of EI, demonstrating that from different assessment and conceptualization approaches, these emotional skills have been shown to be predictors of emotional well-being and psychosocial adjustment of people, showing their predictive value in different groups and contexts. In addition, some lines and challenges for the future in this field are offered, as well as guidelines to take into account in training and intervention programs of these skills. He has been a research member and leads different R&D projects related to the assessment and development of emotional intelligence and positive personal resources in educational and professional contexts in Spain and Latin America. He currently collaborates with several research groups and laboratories in the USA, The Netherlands, Portugal and Finland. He is the author of more than 250 scientific contributions including articles in national and international journals, books and book chapters on various areas related to emotional skills, personal resources, well-being and stress in health, occupational and educational settings.