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There are many languages in the world and there are many reasons for learning them.
First of all - it is great for travelling.
Knowing a foreign language opens the door to the world for you.
If you choose to learn a commonly spoken language,such as English,you can travel practically anywhere in the world and not have trouble with translations.
Learning a new language gives you also an opportunity to learn about a new culture.
What is more,learning a foreign language is an exercise for your brain,it expands your,vocabulary,gives you a greater global understanding as well as awesome job opportunities.