Nectaries are specialized glands in plants that produce nectar, a sugary liquid. These glands can be found in various parts of the plant, including flowers, leaves, and stems. Floral nectaries are located within the flowers and are primarily involved in attracting pollinators like bees, butterflies, and birds. By providing a reward of nectar, plants encourage these animals to visit, facilitating the transfer of pollen and helping in reproduction. Extrafloral nectaries are located outside the flowers and serve to attract predatory insects that help protect the plant from herbivores. Nectar is rich in sugars such as glucose, fructose, and sucrose, and serves as a vital energy source for pollinators. It may also contain amino acids, vitamins, and minerals. Through this complex relationship, nectaries and nectar play a vital role in the survival and ecological interactions of plants. The book presents researches and studies performed by scientists across the globe. It aims to shed light on some of the unexplored aspects of nectaries and nectar and the recent researches in this field. This book is an essential guide for both academicians and those who wish to pursue this discipline further.