What does java plug-in mean? Can you briefly tell me about it?

There is really no way to explain this. For example, a software needs a lot of support to run, but the software itself cannot provide that much support, or even if it does, it will make the software very large, so it needs other plug-ins. These supports are provided. Generally, these plug-ins appear in smartphones and computers, and there are very few Java software. Currently, the only ones I know of are supported by Sony Ericsson's non-intelligent db3210 platform and above, and only high-platform non-intelligent machines like u100 have this built-in. It’s too troublesome to develop this kind of software, and it doesn’t support many mobile phones; so I basically don’t see these things outside.