Domain Authority Checker tools are online applications that allow you to check the authority of a website's domain. Domain Authority is a metric developed by Moz, a popular SEO tool provider, that predicts how well a website will rank on search engine results pages (SERPs).

The Domain Authority Checker tool uses a numerical scale of 0 to 100, with higher scores indicating a greater likelihood of ranking higher on SERPs. The score is calculated based on various factors, including the number of quality backlinks a website has, the age of the domain, the popularity of the website, and other factors that search engines consider when ranking websites.

To use a Domain Authority Checker tool, you simply enter the URL of the website you want to check, and the tool will generate a score and provide additional insights and recommendations to improve your website's ranking. Some Domain Authority Checker tools also provide information about the website's page authority, which is similar to Domain Authority, but focuses on individual web pages instead of the entire domain.

Overall, Domain Authority Checker tools are useful for website owners, SEO professionals, and anyone else who wants to improve their website's visibility and ranking on search engine results pages.