CEFR, or the Common European Framework of Reference for Languages, is a standardized framework used to assess and describe an individual's language proficiency in multiple languages, including English.

It categorizes language skills into six levels, ranging from A1 (beginner) to C2 (proficient). These levels help individuals, educators, and employers worldwide to understand and compare language abilities, making it easier to assess language skills, set learning goals, and ensure that language learners receive appropriate instruction.

The CEFR levels are particularly valuable for language learners, as they provide a clear roadmap for language acquisition and enable learners to measure their progress and communicate their language abilities effectively to potential employers and academic institutions.