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 coatings. The choice of drum head affects the tone, volume, and overall sound quality of the drum. There are two main types of drum heads: batter heads, which are struck by the drummer, and resonant heads, which enhance the drum's sound. Popular brands like Remo and Aquarian offer a wide range of drum heads for different styles and preferences, catering to both beginners and professional drummers.