SEO and growth glossary

C Terms and Definitions

175 plain-English definitions begin with C. Showing page 4 of 5.

C definitions, page 4

Core update: Common shorthand for a Google broad core ranking update.
Core Web Vitals: Google's set of user experience metrics covering loading, interactivity, and visual stability.
Core Web Vitals report: A Search Console report grouping URLs by their Core Web Vitals status across mobile and desktop.
Cornerstone content: Foundational pages on a site that anchor a topic and are central to internal linking.
Cost per acquisition: The average advertising cost incurred for one acquired customer or conversion.
Cost per click: The amount paid each time a user clicks a paid search advertisement.
Cost per mille: The advertising cost per thousand impressions.
Country code top-level domain: A two-letter top-level domain assigned to a specific country or territory.
Country report: A Search Console performance report breakdown by user country.
Country targeting: Indicating the country a site or section is intended for, configured in Search Console or via signals.
Course schema: A structured data type describing an educational course.
Coverage area: The geographic area a service area business serves.
Coverage report: A historical Search Console report showing index status, replaced by the page indexing report.
CPA: Cost per acquisition, the average advertising cost per acquired customer or conversion.
CPC: Cost per click, the advertising cost paid per click.
CPM: Cost per mille, the advertising cost per thousand impressions.
Crawl anomaly: A Search Console label indicating an unexplained crawl error returned for a URL.
Crawl budget: The set of resources a search engine is willing to allocate to crawling a site over a given period.
Crawl capacity: The maximum crawl rate a site's infrastructure can sustain without performance degradation.
Crawl demand: The level of interest a search engine has in crawling a site's URLs based on freshness and importance.
Crawl depth: The number of levels deep into a site that a crawler reaches from the start URL.
Crawl efficiency: The proportion of crawler requests that result in indexable, useful URLs being fetched.
Crawl error: A failure encountered by a search engine crawler when attempting to fetch a URL.
Crawl frequency: How often a crawler revisits a given URL or site.
Crawl log: A record of crawler activity on a site, derived from server logs.
Crawl opt-out: A directive declining to allow a particular crawler, typically used for AI training crawlers.
Crawl path: The sequence of internal links a crawler follows from one URL to another.
Crawl prioritization: The mechanism by which a crawler decides which URLs to fetch next given its budget.
Crawl rate: The number of requests per second a crawler makes against a server.
Crawl rate limit: An upper bound on crawl rate set by Google or by a server's response performance.
Crawl stats report: A Search Console report providing information on Googlebot's crawl behavior on a site.
Crawl trap: A site condition that causes crawlers to fetch unbounded or duplicate URLs, wasting crawl budget.
Crawl-delay directive: A robots.txt instruction asking a crawler to wait a given number of seconds between requests, observed by some engines.
Crawlability: The extent to which a search engine crawler can access and traverse a site's URLs.
Crawler: An automated program that systematically browses the web to discover and fetch content.
Crawling: The process of automated programs discovering and fetching URLs across the web.
Critical CSS: The minimal subset of CSS required to render above-the-fold content, often inlined to speed up first render.
CRO: Conversion rate optimization, the discipline of testing and improving on-site experiences to increase conversion.
Cross-domain canonical: A canonical tag that points from a page on one domain to a preferred URL on a different domain.
CrUX: Chrome User Experience Report, a public dataset of Core Web Vitals from real Chrome users.