The AARRR framework, introduced by Dave Mcclure, has been foundational for startups and growth marketers worldwide.AARRR metrics help in mapping the customer journey, identifying bottlenecks, and monitoring product performance.Extensions like the AAARRR model add 'Awareness' as a stage before Acquisition, emphasizing problem and solution awareness.Brian Balfour's growth loop model transforms the linear funnel concept into a cycle where existing users drive new user acquisition.Growth loops, exemplified by user-generated content and referral programs, create self-reinforcing systems for exponential growth.The Bowtie framework extends the funnel to include post-purchase stages, focusing on customer loyalty and expansion.The Pillar/Motions matrix emphasizes organizational structure and cross-functional collaboration to avoid silos and optimize growth.This approach clarifies that every function contributes to each stage of product growth, promoting responsibility and collaboration.Frameworks from AARRR to Bowtie reflect the evolving complexity of digital products and customer journeys.Successful companies adopt hybrid approaches tailored to their unique product, audience, and growth challenges for sustainable growth.