What is the Language that use in back-end and front-end in applications

Question

What is the most popular Language that use in back-end and front-end in IOS and Android Application devlopment?
Please im confused of what language is right?

Answer 1

Better to use google for these type of questions.
There are many backend laguages. It depends on what you intend to do.
https://blog.back4app.com/best-backend-language/

You have already asked about what's the best. https://www.sololearn.com/Discuss/3080583/?ref=app

Answer 2

Java is best for android development, so if you're searching for a programming language which is useful for that I advise you java