Abstract: The evolving knowledge economy has fundamentally transformed how organizations approach workplace learning and development. This article examines the dynamic interplay between formal and informal learning dimensions within contemporary work environments, drawing on established human resource development (HRD) scholarship. While formal learning remains essential for structured skill acquisition, informal learning increasingly drives adaptation, innovation, and competitive advantage. However, the traditional dichotomy between these approaches obscures their complementary nature and interdependence. Through analysis of theoretical frameworks and organizational practices, this article demonstrates that effective workplace learning requires integrating both dimensions within expansive learning environments that balance organizational performance objectives with individual development needs. The article synthesizes evidence on learning conditions, transfer mechanisms, and contextual factors while highlighting critical considerations including equity, knowledge control, and learner agency. Implications for HRD practitioners emphasize the necessity of systematic needs analysis, strategic alignment, and cultivation of learning-supportive organizational cultures that recognize workplace learning as simultaneously spatial, social, and developmental.