User blog comment:DUBST3P1/What is steam?/@comment-6138112-20141126092747

Steam, also known as water vapour, though not exactly the same, is the result of boiling water to or beyond boiling point (100°C). Is is usually either invisible to the naked eye or can be translucent if it is thick enough. Steam, like most heated things, travels upwards where it then comes back down, causing convection in insulated places or on warm days.

It's also a PC platform with almost 4000 games, 100,000,000 Users, with 3,000,000 users online at any given time.