Abstract
Macro algae can grow both in freshwater and marine system and it is known as seaweeds. They are capable of performing the photosynthesis by which they approximately produce half of the atmospheric oxygen and which is almost essential for all living system. Seaweeds can grow at suitable conditions such as light, temperature and nutrients. When Seaweeds are subjected to variety of stress, they can able to produce both primary and secondary metabolites. Those valuable components can be used in wide range of spectrum applications such as food, feedstock, chemicals and biofuels etc. It can serve as renewable energy because they convert lipids to biofuels through thermochemical and biochemical process. Seaweeds are good potential source of proteins, polysaccharides, fibers, vitamins and minerals and also consists of trace elements like iodine, bromine, vitamins, stimulatory substances and they are antibiotic in nature. Seaweeds phytochemicals act as gelling, stabilizing and thickening agent. Its has wide range of application in the medical field.
