Polytheism is the worship or belief in multiple deities usually assembled into a pantheon of gods and goddesses, along with their own religions and rituals.
Polytheism is a type of theism. Within theism, it contrasts with monotheism, the belief in a singular God. Polytheists do not always worship all the gods equally, but can be henotheists, specializing in the worship of one particular deity. Other polytheists can be kathenotheists, worshiping different deities at different times.
Polytheism was the typical form of religion during the Bronze Age and Iron Age, up to the Axial Age and the gradual development of monotheism or pantheism, and atheism. It is well documented in historical religions of Classical antiquity, especially Greek polytheism and Roman polytheism, and after the decline of Greco-Roman polytheism in tribal religions such as Germanic paganism or Slavic mythology. There are various polytheistic religions practiced today, for example Hinduism, Shintoism, Chinese folk religion, Thelema, Wicca, Druidry, Taoism, Asatru and Candomble.
Read more about Polytheism: Terminology, Gods and Divinity, Types of Deities, Mythology and Religion, Historical Polytheism, Folk Religion, Neopaganism