Drum heads are a membrane stretched over the open ends of a drum. When you strike the head, the sound resonates inside the drum shell, creating the percussive sound. You can strike the head using a variety of instruments: your hand, mallets, brushes, or sticks.
Drum heads were originally made using animal skins. In 1956 Chick Evans pioneered the use plastic to make drum heads and an entire industry was launched shortly thereafter with Mylar. Skin is still sometimes used by historical performance groups seeking authenticity and to make hand drums.
Drum heads are held in place by the rim. Bolts screw the rim into the shell using lugs, which tunes (adjusts the tension of) the head.

Drum pad sets are great for beginning drummers. These sets are made up of many practice pads. Practice pads are an easy way for a person to learn how to play the drums.

Drum pad sets are electronic. There can be multiple pads or a single pad. If there are multiple pads in a set then they will usually all make different drum sounds.

Drum pad sets are often available with sticks. Drum sticks are an important tool for drumming. After a musician is finished using a pad set they will often be able to roll the set up for easy storage.