An electric arc is a visible discharge of electricity that occurs when a current flows through the air between two conductive points. This phenomenon typically happens when the electrical resistance of the air is overcome, allowing the current to jump across a gap. Electric arcs are often seen in welding, where they generate intense heat to melt and fuse materials together. The arc produces bright light and can reach extremely high temperatures, making it useful in various applications, including arc welding and plasma cutting. However, electric arcs can also pose safety risks, as they can cause burns or ignite flammable materials if not properly controlled.