Quantum dots are tiny semiconductor particles, typically just a few nanometers in size, that have unique optical and electronic properties. These properties arise from quantum mechanics, which allows them to emit specific colors of light when exposed to energy, such as ultraviolet light. Their size can be precisely controlled, enabling the tuning of their color emission. Due to their versatility, quantum dots are used in various applications, including displays, solar cells, and biomedical imaging. In displays, they enhance color accuracy and brightness, while in solar cells, they improve energy conversion efficiency. Their potential in nanotechnology continues to be explored for future innovations.