ZNap 24 - fr, cn, kr Why are people using these tags? Can I use these tags?

Hello friends
Good morning
Hope all are well and enjoying your time with the great platform in dtube.

My question - fr, cn, kr Why are people using these tags? Can I use these tags?

I have seen many people They used these tags in their post. These tags are used for what they actually are. Can I use these tags? Please tell me why people use these tags.

Thank you
@toufiqurrahman32