Sample extraction is the process of isolating a specific portion of material from a larger sample for analysis. This technique is commonly used in various fields, including biology, chemistry, and environmental science, to obtain representative data without needing to analyze the entire sample. The extracted sample can be used for various tests, such as DNA analysis, chemical composition, or pollutant detection. Proper sample extraction ensures that the results are accurate and reliable, making it a crucial step in research and quality control processes.