Does Japan use JST?

Excuse me, could you clarify something for me? I've come across a mention of Japan using JST, but I'm not entirely sure what that stands for. Is JST a commonly used time standard in Japan? If so, how does it differ from other time zones or standards that might be used internationally? And how does it affect the way people in Japan conduct business, especially in the cryptocurrency and finance sectors? I'd appreciate any insights you can offer on this topic.