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The matchlock is an early mechanism for firing a gun. Before it, a gunner had to hold the weapon with one hand, and poke the flash pan with a lit match. A matchlock holds the lit match in a lever mechanism, which is spring loaded to drop on the squeeze of a trigger. The upgrade to matchlock gave gunners a simpler firing process, steadier two handed shooting, and a more predictable delay between triggering the shot and actually firing. The next major technology leap beyond the matchlock is the wheellock, where the need to maintain a burning cord is replaced with a sparking mechanism.

Upon pulling a second lever (or in later models a trigger) protruding from the bottom of the gun and connected to the serpentine, the clamp dropped down, lowering the burning match into the flash pan and igniting the priming powder. The flash from the primer travelled through the touch hole igniting the main charge of propellant in the gun barrel. This design removed the need to lower a lighted match into the flashpan by hand and made it possible to have both hands free to keep a firm grip on the weapon at the moment of firing, and to keep both eyes on the target.

Earlier models only had a serpentine pinned to the stock either behind or in front of the flash pan (the so-called "serpentine lock"), one end of which was manipulated to bring the match into the pan.

A variety of matchlock was also developed called the snapping matchlock, in which the serpentine was strongly spring-loaded, and released by pressing a button, pulling a trigger, or even pulling a short string passing into the mechanism. As the match was often extinguished after its relatively violent collision with the flash pan, this type fell out of favour with soldiers, but was often used in fine target weapons.

If the match was not lit when the gun needed to be fired, the mechanism was useless, and the weapon became little more than an expensive club. This was chiefly a problem in wet weather, when damp match cord was difficult to light and to keep burning. Another drawback was the burning match itself. At night, the match would glow in the darkness, potentially giving away the carrier's position. The distinctive smell of burning match-cord was also a give away of a musketeer's position (this was used as a plot device by Akira Kurosawa in his movie Seven Samurai). It was also quite dangerous when a group of men were speedily handling large quantities of gunpowder along with lighted matches. This was one reason why soldiers in charge of transporting and guarding gunpowder were amongst the first to be issued self-igniting guns like the wheellock and snaphance.

The matchlock was invented in Europe some time in the mid 1400s, although the idea of the serpentine appears some 40 years previously in an Austrian manuscript. The first dated illustration of a matchlock mechanism dates to 1475, and by the 1500s they were universally used. The technology was transported to India, China and Japan (in 1543) by the Portuguese and flourished there until the 1900s, particularly in India and Japan. The Japanese Matchlock, or Tanegashima was based on an unknown model of Portuguese snapping matchlock, but was refined so that the difficulties with self-extinguishing matches were almost eliminated. Improvised matchlock guns were used by pro-Indonesia Timor Leste militias in the 1999 conflict.

Despite the appearance of better ignition systems, such as that of the wheellock and the snaphance, the low cost of production, simplicity, and high availability of the matchlock kept it in use in European armies until about 1770. It was eventually completely replaced by the flintlock as the foot soldier's main armament.

• Handgonnes & Matchlocks. A preliminary essay in the history of firearms to 1500