Quantum dots are nanometer-sized semiconductor particles that exhibit unique optical and electronic properties due to quantum mechanics. Their size-tunable bandgaps allow precise control over their color emission, making them valuable in various applications. Quantum dots are widely used in displays, such as QLED TVs, to enhance color accuracy and brightness. They also play a significant role in photovoltaics, improving solar cell efficiency by trapping light more effectively. Additionally, they are employed in biological imaging and targeted drug delivery, enabling improved diagnostics and treatments in medicine. Their versatility continues to drive advancements in nanotechnology and materials science.