The CERF was designed to provide a transparent, coherent and comprehensive basis for the elaboration of language syllabuses and curriculum guidelines, the design of teaching and learning materials, and the assessment of foreign language proficiency. It is used in Europe but also in other continents.
The CEFR describes comprehensively what competence language learners have at a certain level and what communicative situations they can handle. In this way you can measure your learning progress throughout your life and at each level.