Growth hacking is a new business method that’s prevalent in Silicon Valley. People who master this business method are called growth hackers. They not only know about the basic technology of the Internet industry but the psychological traits of users. They are proficient in Internet marketing and skilled at using creative methods and data analysis tools. They can also help a company’s products achieve explosive growth in a short period at a low cost or even no cost at all. This book introduces hacking growth, and many startups think highly of its lessons.