A major change is happening in education, with ubiquitous learning, or u-learning, making knowledge accessible through various digital platforms anytime and anywhere. By integrating mobile technologies, cloud computing, artificial intelligence (AI), and the Internet of Things (IoT) into teaching and learning, u-learning goes beyond traditional e-learning. This essay explores the theoretical background, practical uses, and challenges of u-learning. It also addresses issues like digital fairness, privacy, and teaching adaptability, while highlighting how u-learning supports personalized, collaborative, and lifelong learning. The paper emphasizes the transformative role of ubiquitous learning in building education systems ready for the future, drawing on previous academic research.