what is language interoperability in C# .net and some example?

You can refer below links:

https://www.dotnetspider.com/resources/44567-Interoperability-Net.aspx

https://www.c-sharpcorner.com/UploadFile/84c85b/cross-language-interoperability-with-C-Sharp-net/

https://www.codeproject.com/Articles/588865/Interoperability-feature-in-NET

Thanks.