Microalgae are tiny, photosynthetic organisms found in water, including oceans, lakes, and rivers. They are essential to the ecosystem, producing oxygen and serving as a primary food source for various aquatic life forms. Microalgae can be single-celled or multicellular and come in various colors, including green, blue, and red. These organisms are also gaining attention for their potential in sustainable energy and nutrition. They can be cultivated to produce biofuels, nutraceuticals, and animal feed, making them a valuable resource for addressing global challenges like food security and climate change.