A common algorithm used for search optimization is the PageRank algorithm, originally developed by Google. PageRank assesses the relevance and quality of web pages based on their incoming links, essentially ranking them in search results. This algorithm considers not only the quantity but also the quality of links from other sites, allowing search engines to deliver more accurate results to users. It has paved the way for further advancements in search engine optimization (SEO) and continues to influence how content is prioritized across the web.