Domain Authority (DA) is a metric developed by Moz, a leading provider of search engine optimization (SEO) tools, to predict how well a website will rank on search engine result pages (SERPs). The DA score of a website is a numerical value that ranges from 1 to 100, with higher scores indicating a higher likelihood of ranking well in search results.
A domain authority checker is a tool that allows you to measure the DA score of a website. The tool uses an algorithm to analyze various factors, such as the quality and quantity of inbound links, the age of the domain, and the content on the website, to calculate a DA score. The score provides an estimate of how well the website is likely to perform in search engine results.
There are many free and paid domain authority checkers available online. Some popular options include Moz's Open Site Explorer, Ahrefs, and SEMrush. To use these tools, simply enter the URL of the website you want to check, and the tool will provide a report on its DA score, along with other important metrics, such as the number of backlinks, the top-ranking keywords, and the top-linked pages.
It's important to note that domain authority is just one of many factors that can influence how well a website ranks in search results, and it should be used in conjunction with other metrics, such as Page Authority (PA) and keyword ranking, to get a full picture of a website's performance.