A simulcast is the streaming of an anime episode in international markets at the same time as, or within hours of, its Japanese broadcast. Simulcasting is the distribution system that replaced the long licensing delays of the disc era.
Simulcasting rewired international fandom. Before it, overseas viewers waited months or years for licensed releases, and unlicensed fan translation filled the gap. Same-day legal streaming collapsed the distance: a fan in Toronto and a fan in Tokyo now watch a new episode on the same evening, discuss it in the same hour, and build a genuinely global weekly conversation.
The business rests on licensing windows negotiated territory by territory, which is why availability still varies by country and why a handful of titles each season are not simulcast anywhere. Release timing matters to accuracy as well as access: what has officially aired, and where, defines what can be treated as released fact.
This site's spoiler horizons are measured against official releases only, and the simulcast era is the reason that rule is workable. When the whole world can watch legally on day one, there is no excuse for a quiz built on leaks, and no need for one either. Day-and-date release also changed spoiler culture worldwide, since the entire global audience now crosses story thresholds together instead of in waves separated by months of licensing.
In use"An episode streaming legally in North America the same morning it airs in Japan is a simulcast."