A plasma cutter is a tool used to cut through electrically conductive materials like steel, aluminum, and copper. It works by creating a high-temperature plasma arc that melts the metal, allowing for precise cuts. Plasma cutters are popular in industries such as manufacturing, automotive, and construction due to their speed and accuracy. These devices can be powered by compressed air or inert gases, which help to stabilize the plasma arc. Plasma cutters come in various sizes, from portable models for small jobs to larger, industrial-grade machines for heavy-duty applications. They are valued for their ability to cut intricate shapes and designs efficiently.