Technology-Enhanced Learning in the COVID-19 Era: A Systematic Review of Online Education Platforms, Student Engagement, and Digital Equity

The rapid, largely unplanned shift to online and remote instruction that accompanied the COVID-19 pandemic in 2020 accelerated more than a decade of gradual educational technology (EdTech) adoption into a matter of weeks, making 2021 a pivotal moment for taking stock of what a full decade of research had, and had not, established about technology-enhanced learning. This paper presents a systematic review and bibliometric synthesis of research on online learning platforms, student engagement, and digital equity published between 2010 and 2021. Following PRISMA-guided screening of 4,204 records identified across Scopus, Web of Science, ERIC, and IEEE Xplore, 172 studies met inclusion criteria and formed the analytic corpus. Bibliometric mapping of publication trends, leading journals, contributing countries, and keyword co-occurrence networks was combined with thematic synthesis of application types, benefits, and challenges. Results show a slow, steady growth in online-learning research through 2019 followed by an unprecedented spike in 2020–2021 coinciding with global school and university closures. Learning management systems, videoconferencing platforms, and mobile learning applications were the most frequently studied technologies, while the most consistently reported benefits concerned flexibility and access, and the most consistently reported challenges concerned the digital divide, teacher readiness, and diminished student engagement. The review synthesizes these findings into an integrated model of technology-enhanced learning adoption and outlines a research agenda emphasizing equity-oriented implementation, hybrid pedagogical design, and longitudinal evidence on learning outcomes. All literature synthesized and cited in this review was published between 2010 and 2021, providing a historically bounded account of the decade culminating in education's pandemic-driven digital transformation.