This document provides a summary of the book "21 Days of Effective Communication" which aims to improve readers' communication skills through daily exercises over 21 days. The introduction discusses how the author struggled with communication in his youth and career but overcame this through self-development resources and writing his own books. He created this book to help others develop their skills quickly with brief exercises based on psychology. Readers are encouraged to actively practice the daily lessons and tips in order to form new habits within the 21 day period outlined.