There are over 700 programming languages in the world, and the list is constantly growing. Most IT teams in large companies and startups use several languages and frameworks simultaneously. Developers, too, are increasingly becoming bilingual and multilingual and mastering 2 to 5 languages, including testing new technologies. Why this is needed:

New tools and frameworks pump up skills and help you look at trivial tasks in new ways. Even if you don’t use new languages in your work, knowing them will help you find out-of-the-box coding solutions.
There’s a chance to catch the wave and become in demand before the language becomes mainstream. While everyone else is learning the basics, you’ll already be at an advanced level.
When working on a complex project, it will be easier for you to choose the right language and framework. By understanding the specifics of different languages, you can easily determine which tool will solve the problem more efficiently.