A "Lab-On-A-Chip" is a miniaturized device that integrates multiple laboratory functions onto a single chip, often no larger than a credit card. It allows for the analysis of biological samples, chemical reactions, and other tests using very small volumes of fluids. This technology can significantly reduce the time and cost of experiments while increasing efficiency and accuracy. These chips utilize microfluidics, which involves the precise control and manipulation of tiny amounts of liquids. Applications of Lab-On-A-Chip include medical diagnostics, environmental monitoring, and drug development, making it a valuable tool in fields like biotechnology and pharmaceuticals.