What is Ondo Japan?

Could you please clarify for me what exactly "Ondo Japan" is? I've been hearing this term quite often recently but I'm still a bit hazy on its meaning. Is it a company, an event, or a cultural tradition? If it's a company, what does it specialize in? And if it's an event or cultural tradition, could you elaborate on its origins and significance? Additionally, is "Ondo Japan" widely recognized or is it more of a niche concept? Your insights would be greatly appreciated!