A Soxhlet extractor is a laboratory device used to extract compounds from solid materials. Its working principle is continuous solvent extraction, where the sample is repeatedly washed with solvent to extract soluble substances. This method is particularly suitable for separating compounds that are not easily soluble in a single solvent extraction. So, it is often used in fields such as food analysis, environmental testing, drug research, and chemical analysis, and is an important instrument for obtaining pure extracts and analyzing complex mixtures.