What is the difference between steam and water vapor?

Temperature - at temperatures lower than the boiling point of water it is called water vapor, when it is released from boiling water it is called steam.

"Water vapor or aqueous vapor is the gas phase of water. It is one state of water within the hydrosphere. Water vapor can be produced from the evaporation or boiling of liquid water or from the sublimation of ice. Unlike other forms of water, water vapor is invisible."

https://en.wikipedia.org/wiki/Water_vapor

"Steam is the technical term for water vapor, the gaseous phase of water, which is formed when water boils. Water vapor cannot be seen, though in common language it is often used to refer to the visible mist of water droplets formed as this water vapor condenses in the presence of cooler air. Strictly speaking, in terms of the chemistry and physics, true steam is invisible."

https://en.wikipedia.org/wiki/Steam