The book "English Vocabulary in Use Upper-intermediate 4th Edition" by Klett & Balmer is aimed at learners at the upper-intermediate level (B2) of the English language. It offers a comprehensive collection of over 100 units designed to expand learners' vocabulary and boost their confidence in communication. The explanations are clear and easy to understand, facilitating both self-study and classroom use. The content is based on current Cambridge research on the actual use of the English language, helping learners develop a realistic understanding of vocabulary usage. Additionally, the book includes special units to improve learning methods and provides personalized practice opportunities as well as a user-friendly answer key.