Removal techniques refer to various methods used to eliminate unwanted substances or materials from a specific area. These techniques can be applied in different fields, such as cleaning, construction, and medical procedures. Common examples include suction, scraping, and chemical solvents, each chosen based on the type of material being removed and the surrounding environment. In the context of medical procedures, removal techniques may involve surgical methods to extract tumors or foreign objects from the body. In environmental cleanup, techniques like bioremediation or excavation are employed to remove pollutants from soil or water. Each technique is designed to ensure safety and effectiveness in achieving the desired outcome.