Migrations are consistently one of the highest-risk events in SEO because they can affect every single ranking signal at once — if not handled carefully, a poorly executed migration can lose accumulated backlink equity, break internal linking, and trigger duplicate-content or indexing confusion across an entire site simultaneously, rather than the isolated, page-by-page issues most SEO work deals with. A responsible migration checklist includes a full pre-migration URL inventory, a complete 301 redirect map from every old URL to its new equivalent (not just the homepage and top pages), updated internal links pointing to new URLs rather than relying purely on redirects, an updated and resubmitted XML sitemap, and close post-migration monitoring of Search Console for crawl errors and ranking volatility in the weeks following launch.
Example
A company migrating from an old CMS to a new platform builds a complete 301 redirect map covering all 800 existing URLs before launch, rather than relying on generic pattern-based redirects that would miss dozens of non-standard legacy URLs.
Related terms
Related Reading
404 Error
A 404 error is the standard HTTP status code returned when a requested page doesn't exist on the server — the classic 'page not found' response.
A/B Testing (SEO)
A/B testing in SEO is the practice of showing two versions of a page element — usually a title tag, meta description, or on-page element — to see which one earns a better click-through rate or ranking outcome.
AI Citation
An AI citation happens when an AI assistant like ChatGPT, Perplexity, Claude, or Gemini references or links to a specific page as the source for part of its answer.
