SEO is a part of the growing inbound marketing sector. Inbound marketing tactics include: content marketing through blogging, video, news articles, and content writing. Search engine marketing through organic channels including local, mobile and vertical search. Brand marketing to capitalize on direct traffic and branded search, including news and PR. Email marketing. Social media marketing on platforms like Facebook, Twitter, Google+ and in forums. Community engagement, outreach and customer service. Building links and non-social external traffic referrals. Conversion rate optimization. User experience through design and interface improvements and page speed. Customer retention and lifecycle management. And many other activities. Please check this infographic for more details.