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A volcano is a subclass of mountain. It is named after Vulcano. The subject has parts including volcanic rock. It is made from material such as volcanic rock, magma, lava, and lava flow. Products or materials produced by volcanoes include carbon dioxide, igneous rock, and carbon dioxide in the atmosphere of Earth.

Volcanoes are studied by geology, volcanology, igneous petrology, and geophysics. They are distinct from mud volcanoes and Berkane. The Unicode character for a volcano is 🌋. OpenStreetMap tags volcanoes with natural=volcano. The topic is maintained by WikiProject Mountains, WikiProject Geology, and WikiProject Anthropology. It is referenced by 5,130 other encyclopedia articles.