Search Engine Optimization
Search Engine Optimization (SEO) is the practice of improving a website's visibility in organic (unpaid) search results through content quality, technical health, and authority signals (backlinks). For SaaS, SEO is a primary channel for compounding, low-CAC growth.
Ahrefs built a $100M+ ARR business almost entirely on SEO — creating deep content for every keyword their ICP searches, turning Google into their top acquisition channel.