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SEO Dictionary & Marketing Glossary

Your quick-reference guide to SEO, analytics, and digital marketing. Browse alphabetically or search below for clear, plain-language definitions.

Currently featuring 160+ SEO terms (and growing)

Level343 » SEO Dictionary & Marketing Glossary

Understanding SEO starts with understanding the language. This glossary defines the key concepts, acronyms, and strategies marketers use to build visibility and measure performance.

Whether you’re an aspiring optimizer, a hands-on DIYer, or just trying to make sense of what your agency is saying, this glossary is your go-to guide. We’ve spent years building this collection, covering everything from SEO, social media, HTML and APIs to ISPs, CTAs, and WTFs. And now, with AI reshaping our digital assets, we’ve added even more entries.

So, if you’re diving into a marketing meeting or decoding jargon in a dev chat, keep our dictionary handy. Bookmark and return often, as we’re always adding entries!

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Recently Added Terms

Affiliate Marketing

Affiliate marketing is a performance-based customer acquisitions channel, where the affiliate is paid when visitors complete an action. Learn more about how affiliate marketing works.

AdSense

Google AdSense is an advertising platform that lets website owners make money by showing ads on their site. Learn how Google’s ad program pays publishers and when it’s commonly used on websites and content platforms.

Absolute Link

An absolute link is a hyperlink that includes the full URL, including the protocol (http/https) and domain (domain.com), which ensures the destination resolves to a specific location.

Most Searched Terms

Affiliate Marketing

Affiliate marketing is a performance-based customer acquisitions channel, where the affiliate is paid when visitors complete an action. Learn more about how affiliate marketing works.

A/B Testing

A/B testing is a marketing method where two nearly identical versions of a webpage, email, or ad are shown to different audience segments.

AdSense

Google AdSense is an advertising platform that lets website owners make money by showing ads on their site. Learn how Google’s ad program pays publishers and when it’s commonly used on websites and content platforms.