Bees are essential contributors to pollination processes in agricultural and horticultural ecosystems, directly affecting crop productivity, produce quality, and overall ecosystem health. This article provides a broad review of bee pollination, focusing on bee diversity, basic taxonomy, key identification features, and their distribution across farmland, horticultural fields, forests, and grassland habitats. Both India and other regions of the world support a wide range of bee species, underlining their ecological value and economic relevance. Scientific studies clearly demonstrate that pollination by bees leads to noticeable improvements in yield and quality in important crops such as mustard, sunflower, cotton, tomato, apple, pumpkin, and various vegetable seed crops. Bee pollination should therefore be recognized as a vital ecological input rather than an incidental or cost-free service, as it supports sustainable farming systems, food security, and ecological balance. At the same time, the growing use of chemical pesticides, especially neonicotinoids and pyrethroids, has emerged as a major threat to bee populations, negatively influencing their foraging activity, colony strength, and long-term survival. Protecting both managed and wild bees is essential to ensure stable crop production and the sustainability of agro-ecosystems.