SEO Glossary

A backlink is an inbound link from one website to another. Backlinks are among the strongest ranking signals in Google's algorithm — specifically the quality and relevance of sites linking to you, not raw link count.

Crawl budget is the number of pages Googlebot will crawl on your site within a given time period. It matters when your site has thousands of pages — if Googlebot doesn't crawl a page, that page won't rank.

Technical SEO is the practice of optimising a website's infrastructure so that search engines can crawl, index, and rank it effectively. It covers site speed, crawlability, schema markup, URL structure, and Core Web Vitals — the foundation that content and links build on.

Domain Authority (DA) is Moz's 0–100 score predicting how well a domain will rank in search engines. It is the most widely cited third-party domain metric in the industry, but it is not a Google ranking factor.

Keyword Difficulty (KD) is a 0–100 numeric estimate of how hard it is to rank in Google's top 10 for a given keyword. Each SEO tool calculates it using its own methodology — the same keyword will have different KD scores in Semrush, Ahrefs, and Moz.