A Igae are known as a large, diverse group of eukaryotic, photosynthetic organisms having rich chemical structure and content of bioactive substances having around 166,958 species. This volume 1 is about the plant group Algae, which starts from the Genus Acanthophora Lamouroux and ends with the Genus Wrangelia C. Agardh covering 183 Genera and 378 Species in around 1,000 pages. It provides a brief information on plants, their Synonyms, Common English Names, Vernacular Names, Habitat and Distribution, Botanical Description, Chemical Constituents, Organoleptic Properties and Action, Ayurvedic Properties and Action, Therapeutic Properties, Pharmacological Profile, Larvicidal Activity, Spasmolytic activity, Toxicological Study, Medicinal Uses, Parts Used, Dosage, Veterinary Medicine, Toxicity and such other great features collected from reliable and authentic resources. This volume has highlighted genera like Gracilaria Greville (15 Plant species), Laurencia J. V. Lamouroux. (13 Plant species), and Sargassum C. Agardh (24 Plant species). : an : : : Some species of Genus Gracilaria Greville exhibit aphrodisiac properties and are also used as a base for a nonalcoholic drink. Some species of Gracilaria can be used as an alternative for ethanol production, after ethanol production the leftover residues still contained good amounts oforganic matter and useful minerals. Some of the species of Genus Laurencia J. V. Lamouroux. are edible, have a very peppery flavor and are chopped and salted for use as a spice, others are sweet and used as vegetables in salads or cooked. Likewise, several species of Genus Sargassum C. Agardh are used in the treatment of goiter, scrofula, urinary diseases, dropsy and relieve fever. These species are rich in vitamins, carotenoids, proteins, and minerals. Also, many biologically active compounds like terpenoids, flavonoids, sterols, sulfated polysaccharides, polyphenols, sargaquinoic acids, sargachromenol, pheophytine, plastoquinones, steroids, glycerides, phlorotannins, flucoxanthin, fucoidan were isolated from different Sargassum species. Similarly, the species ofother 180 genera have been elucidated in this volume for their therapeutic properties to meet the reader’s quest for information. All of the plants incorporated in this volume have also been named in the Sanskrit language based on their morphological characteristics through the ‘Vedic Taxonomy’ method.