Domain Authority (DA): Domain Authority is a search engine ranking score developed by Moz that predicts how well a website will rank on search engine result pages (SERPs). The score is calculated based on several factors, including the number of backlinks and the quality of the linking sites. DA scores range from 1 to 100, with higher scores indicating a greater ability to rank. It's important to note that Domain Authority is a comparative metric, meaning it's most useful when comparing scores of different websites rather than focusing on the exact number.