"Nowadays, great interest has been developed in the isolation of novel bioactivbioe compounds from the marine world which represents the half of the global biodiversity and an untapped reservoir of natural ingredients. Among these ingredients microalgae can play a key role. They can biosynthesize many valuable substances with potential applications in the food, feed, pharmaceutical, cosmetic and chemical industry. But the impact of microalgae on the human society is not limited only to their useful products, because of their crucial role on the biosphere through photosynthesis. Microalgae are primitive, aquatic and photosynthetic microorganisms which appeared on earth about 3.5 billion years ago. They have unicellular or simple multicellular structure and size between 0.2 to 2 nm. Peer review refers to the work done during the screening of submitted manuscripts and funding applications. This process encourages authors to meet the accepted standards of their discipline and reduces the dissemination of irrelevant findings, unwarranted claims, unacceptable interpretations, and personal views. Publications that have not undergone peer review are likely to be regarded with suspicion by academic scholars and professionals