An online stream URL can have some metadata added to it such as image, name, country, etc. When that URL is found in the player queue the metadata will be attached to the playing item.
Metadata can be added manually or optionally looked up in the radio-browser community database ( Settings → Radio Stations → Enable radio browser).
Radio stations information is provided courtesy of the radio-browser-info project through its HTTP API.
Settings
Radio stations settings
Radio stations
Radio stations list
Radio browser
Radio stations browser