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The microplastic accumulation rate of coastal and marine organisms varied at 0.1-15,033 counts. The microplastic level of different coastal and marine ecosystems nearly ranged from 0.001-140 particles/m 3 in water and 0.2-8766 particles/m 3 in sediments at different aquatic environments over the world. Microplastics in primary and secondary forms reveal a widespread distribution in the water, sediment, and biota of the marine and coastal habitats. Plastic pollutants are distributed in the ecosystems in different forms, with different size variations as megaplastic, macroplastic, mesoplastic, and microplastic. In this review paper, we focused on highlighting different aspects related to plastic pollution in coastal and marine environments. Land-based and sea-based sources are the primary sources of these contaminants in various modes that enter the ocean. Unprecedented and continuous accumulation of growing plastic contaminants into any respective aquatic ecosystem by the anthropogenic sources causes direct and/or indirect interruption to ecosystem structure, functions, and consequently, services and values. Plastic pollution is recognized as a severe anthropogenic issue in the coastal and marine ecosystems across the world.