Dinoflagellates are tiny, single-celled organisms found mostly in oceans and freshwater. They are a type of plankton and play a crucial role in aquatic ecosystems, serving as a food source for many marine animals. Some dinoflagellates can produce their own food through photosynthesis, while others are heterotrophic, meaning they consume other organisms. These fascinating creatures are known for their unique ability to bioluminesce, creating beautiful glowing effects in the water at night. However, some dinoflagellates can also cause harmful algal blooms, which can lead to red tides and negatively impact marine life and human health.