Mixed martial arts (MMA) is a full-contact combat sport. You can incorporate techniques from any martial art into your MMA game; however, the most effective and most popularly-used combination of martial arts is kickboxing, muay thai, wrestling, and Brazilian jiu-jitsu (BJJ).
An MMA fight starts off standing, and the fighters usually begin by using kickboxing and muay thai striking techniques until one of them uses wrestling to bring the fight to the ground. There the fighters usually use a combination of BJJ grappling techniques along with striking. Striking on the ground is known as ground and pound (GnP).