Glossary

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You'll see lots of terms and acronyms around websites, search engine optimization (SEO) and Internet marketing, many of them obscure. We're here to help. Click a link below for a jargon-free definition.

301 redirect

404 error

500 error

Absolute Path

Alt text

Anchor text

API

Backlink

Canonical URL

C-block

ccTLD

Content farm

Cookie

Crawler

Domain

Domain name

DoFollow (links)

External link

htaccess

H tags

H1 headings

HTML

Image map

Inbound link

Internal link

IP address

Keyword

Keyword density

Link exchange

Link juice

Meta description

Meta keywords

NoFollow (links)

Noindex

PageRank

Pay per click (PPC)

Ranking algorithm

Registrar

Robots.txt

RSS feed

Search algorithm

Session ID

SEO

Sitemap

Site speed

Spam

Spider

Title tag

Top-Level Domain (TLD)

URL

Whois

For more detailed information about these topics, read our articles about online marketing.

Have a question? Is there another term you'd like us to define here? Email Editor@AboutUs.org and let us know.