Evolution and current state of research into E-learning.

This article aims to undertake a bibliometric review along with a conceptual and intellectual analysis of research on distance learning and e-learning. The purpose of this study is to focus on several academic fields and offer a comprehensive approach on how research on distance learning and e-learning has been approached since 1970. This work applies several bibliometric techniques to assess the research evolution of topics addressed, the most productive authors and the most influential journals. The findings revealed an exponential increase of publications over the last 20 years, highlighting the evolution of topics. The research themes include four main groups: the first relates to pedagogical processes in terms of effectiveness, outcomes, learning strategies, interaction, and self-regulation; the second group includes aspects associated with ICT applied in distance education; the third group focuses on the perceived value, usefulness, acceptance, and satisfaction of e-learning; and the last group portrays the forced application of distance learning strategies to deal with the consequences of the pandemic. This work contributes to expanding the existing literature devoted to study the structure of research on e-learning. It analyses the most representative authors, institutions, and documents, and gathers the growing literature on e-learning, from distance learning in the seventies until the implementation of online learning in the COVID-19 era.