CEFR that stands for Common European Framework of Reference for Languages is a way of representing your ability to communicate in a foreign language. There are some other frameworks with comparable goals, such as the American Council on Canadian Language Benchmarks (CLB), the Teaching of Foreign Languages (ACTFL) Guidelines, and Interagency Language Roundtable (ILR) scales.
CEFR is not bound to a particular language test. For example, one of the countries that use this language standard is the UK. The government of the UK even also use one of the tests of CEFR which is the B1 English test that you can know more on britishlifeskills.com as one of the requirements for one to be able to be a new British citizen. Thus, the CEFR is a European scale and is particularly created to employ to any European language, so it may be utilized to illustrate your English proficiency, German language proficiency, or Estonian language proficiency (if you have those skills).