A quantum dot is a tiny semiconductor particle, typically just a few nanometers in size, that exhibits unique optical and electronic properties due to quantum mechanics. These properties arise because the electrons in quantum dots are confined in three dimensions, leading to quantized energy levels. This allows quantum dots to emit specific colors of light when excited, making them useful in various applications. Quantum dots are used in technologies such as LEDs, solar cells, and biomedical imaging. Their ability to produce bright, tunable colors makes them valuable in displays, like those found in televisions and smartphones. Researchers are also exploring their potential in quantum computing and photovoltaics.