Growth hacking is a marketing approach that combines technical methods, data analysis, and marketing expertise to cultivate customer acquisition and retention in rapidly evolving digital channels. It helps CMOs tackle the increasing complexity of digital marketing and constant disruption of customer channels. Growth hacking uses techniques like data analytics, A/B testing, and channel optimization to appeal to customers across multiple touchpoints like mobile apps, social media, and APIs. While technical, growth hacking is still focused on marketing goals like growing customers and revenue.