A Domain Authority Checker is a tool that evaluates and provides insights into a website's domain authority (DA), a metric developed by SEO platforms like Moz to predict a site's ability to rank in search engine results. The DA score, ranging from 1 to 100, is calculated based on factors such as the quality and quantity of backlinks, domain age, and overall trustworthiness of the site. Higher scores indicate a stronger likelihood of ranking well on search engines. This tool is widely used by marketers, SEO specialists, and webmasters to assess their site's competitive standing, monitor improvements, and compare performance against competitors.