According to VG Insights*, more than 50% of indie games on Steam have never made more than $4,000, but the top 1% make more than $7 million. Whether you are an avid gamer or an interested bystander, you've probably heard of Steam.

This digital storefront, which launched in September 2003, evolved from a simple portal to a gaming hub where you can review, buy, and contribute to the development of games. To give you an idea of Steam's initial interface, here's what it looked like 18 years ago: