What is the difference between an SEO audit and a security audit?

They look at the same website and answer different questions, which is why a business can score well on one and badly on the other:

• An SEO audit asks whether you can be found - indexing, titles, structure, speed, links.
• A security audit asks whether you can be trusted and reached - certificates, security headers, email authentication, DNS integrity.
• The gap is measurable - the same Australian small business sites median A+ on technical visibility and E on web security^*.

For an agency already selling SEO, the security half is an adjacent service the client currently buys from nobody.