Purse seining is a fishing technique used to catch schools of fish, particularly in open waters. A large net, called a purse seine, is deployed around a school of fish. The net is then drawn tight at the bottom, trapping the fish inside. This method is effective for catching species like tuna and sardines. The process begins with a fishing vessel locating a school of fish, often aided by sonar technology. Once the net is set, the crew pulls the seine closed, securing the catch. Purse seining is popular due to its efficiency and ability to capture large quantities of fish quickly.