The book 1100Words You Need to Know is one of the most well-known books published in the field of improving English vocabulary. This book is suitable for learners whose language level is at least intermediate and who want to learn English academic words; The words taught in this book are rarely used in colloquial language and are more common in academic and formal texts. IELTS and TOEFL candidates are also recommended to read this book.

The book 1100Words You Need to Know has grouped words into 46 weeks. This classification is such that learners are expected to learn 5 words per day (there are 20 words and 4 idioms in this book for each week). The words that are taught are first used in a text, then exercises for new words are presented, and at the end of each day's vocabulary, a list of new words with their phonetics is placed.