What is Site Migration?
Any platform, domain, protocol, or architecture change affecting URLs. Safe migrations map every old URL, preserve signals with 301s, and monitor indexation and logs for weeks after.
Related terms
301 Redirect
A permanent redirect passing most ranking signals to the target URL. Use it for migrations, consolidation, and retired pages with a live equivalent.
Redirect Chain
Two or more redirects in sequence before the final URL. Chains waste crawl budget, slow users, and dilute signals; audits should flatten them to a single hop.
Log File Analysis
Reading server logs to see which URLs bots actually fetch, how often, and with what status. Logs reveal crawl waste and orphaned discovery that crawler simulations can only guess at.
Technical SEO
The crawling, indexing, rendering, and performance work that lets search engines reach, understand, and serve your pages. It covers directives, architecture, speed, and structured data rather than words on the page.
Crawling
How search-engine bots discover pages by following links, sitemaps, and directives. If a URL is never crawled, it cannot be indexed no matter how good its content is.
Crawl Budget
The number of pages a search engine will crawl on a site in a given period, driven by server capacity and demand signals. Large or slow sites must spend it on indexable, valuable URLs.