The Common European Framework of Reference for Languages: Learning, Teaching, Assessment, abbreviated in English as CEFR or CEF or CEFRL, is a guideline used to describe achievements of learners of foreign languages across Europe and, increasingly, in other countries.

The CEFR is also intended to make it easier for educational institutions and employers to evaluate the language qualifications of candidates to education admission or employment. Its main aim is to provide a method of learning, teaching and assessing that applies to all languages in Europe.

Source: https://en.wikipedia.org/wiki/Common_European_Framework_of_Reference_for_Languages 

Note: As an avid language learner, I like the A2 or rather B1 levels as they offer a great compromise between the time invested to learn a language and the level of fluency. In short, you can reach the B1 level relatively fast while being able to converse very comfortably in that language. It’s a great example on how to use the Pareto principle for langage learning! 🙂