Plants are multicellular organisms of the kingdom Plantae. They are primarily photosynthetic eukaryotic organisms and include flowering plants, conifers, ferns, gymnosperms, etc. The branch of plant biology is concerned with the scientific study of plants. Modern botany integrates aspects of molecular genetics and epigenetics in plant studies. The provision of staple foods and materials such as oil, rubber and drugs is achieved by the application of botanical studies. Plants play a crucial role in maintaining the balance of carbon cycle and water cycle. Research in this field focuses on the identification of plant species and commercial plant varieties by DNA barcoding. This book presents the complex subject of plant biology in the most comprehensible and easy to understand language. It provides significant information of this discipline to help develop a good understanding of botany and related fields. The book is appropriate for students seeking detailed information in this area as well as for experts.