Drum heads are the membranes stretched over the top and bottom of a drum, which produce sound when struck. They can be made from various materials, including plastic and animal skin, and come in different thicknesses and sizes. The type of drum head affects the tone and volume of the drum, making it an essential component for drummers. There are two main types of drum heads: batter heads, which are struck by the drumsticks, and resonant heads, which vibrate to enhance sound. Popular brands like Remo and Aquarian offer a wide range of drum heads tailored for different musical styles and preferences.