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Plankton refers to the diverse assemblage of drifting organisms that inhabit both freshwater and marine ecosystems. These microscopic to minute-scale life forms encompass a wide range of taxa, primarily including bacteria, archaea, algae, and protozoans, although some tiny animals such as crustaceans and jellyfish are also categorized as planktonic due to their drifting nature. The term "plankton" is derived from the Greek word "planktos," meaning wandering or drifting. Plankton can be further divided into two main groups based on their nutritional strategies: phytoplankton (plant-like organisms that perform photosynthesis) and zooplankton (animal-like organisms, which consume other plankton for sustenance). These organisms form the base of aquatic food webs, providing essential energy sources and serving as critical indicators of water quality and ecosystem health. Plankton plays a pivotal role in global biogeochemical cycles, such as carbon and nutrient cycling, shaping our planet's climate and influencing the productivity of fisheries and other marine resources.