A "Gene Chip," also known as a microarray, is a small device used to measure the expression levels of many genes at once. It consists of a solid surface, usually made of glass or silicon, onto which thousands of tiny DNA fragments are attached. Researchers can use these chips to analyze genetic variations, study diseases, and understand how genes interact with each other. Gene chips are valuable tools in fields like genomics and personalized medicine. They help scientists identify specific genes associated with conditions such as cancer or diabetes. By understanding gene expression patterns, researchers can develop targeted therapies and improve diagnostic methods.