SEO services break into three core areas: technical optimization, content strategy, and link building. Technical optimization fixes site speed, mobile responsiveness, and crawlability so Google can index your pages efficiently. Content strategy involves researching keywords your audience searches for, then writing pages that answer those queries better than competitors do. Link building earns citations and backlinks from relevant websites, which Google interprets as credibility signals.
Most agencies also provide ongoing reporting, competitive analysis, and strategy adjustments based on performance data. The mix and depth of these services varies significantly by agency and engagement model. Some agencies offer all three areas; others specialize in one. The right fit depends on where your site needs the most work and what your budget allows.
For a detailed breakdown of each service type and how they work together, see our SEO services overview.