Is coblo a computer language used only in Japan?

Of course not. Cobol is the basic language of mainframe, which is very close to hardware and is found all over the world.

Mainly used in servers and mainframes. For Japan, it is because Japan is the country that uses this language closest to China. In fact, it is also used in Europe and America, but it has not been brought to China. China basically does not, because many of our industries are not digitized, such as servers in the financial industry. It is many years behind Japan and Europe and America.

But this language is really primitive and simple, similar to assembly. You can get started with a little learning, and you will become proficient with a project.

So if you are interested in the cobol position you are recruiting, you might as well read the book for two days first, which is enough to muddle through.