Trawling needs involve the use of NETS, which are four-letter tools used to catch fish and other aquatic creatures. NETS are typically made of rope or mesh and are used in a variety of ways, such as trawling, purse seining, and gillnetting. Trawling is a fishing technique that involves dragging a net through the water to capture fish. It is often used in deep waters and can be done with a single or multiple NETS. Purse seining is a method of fishing where a large net is set around a school of fish and then drawn closed like a purse. Gillnetting is a type of fishing that uses a wall of netting to entangle fish as they swim by. All of these techniques require the use of NETS, making them essential for trawling needs.