Siphoning is a process used to transfer liquid from one container to another using a tube. It relies on gravity and atmospheric pressure to move the liquid. The tube is placed in the source container, and once the liquid is drawn into the tube and the end is lowered, the liquid flows out due to the difference in height. This technique is commonly used in various applications, such as transferring fuel from a gasoline tank or draining water from a swimming pool. Siphoning can be efficient and effective, but it requires careful handling to avoid spills or contamination.