Status codes are an essential part of HTTP that provide guidance for website visitors and search engines when requesting information from a site. The most common status codes include 200 for a successful request, 301 and 302 for redirected pages, 404 for pages not found, and 503 for temporary server outages. This presentation defined and explained several important HTTP status codes that search engine optimizers and webmasters encounter, such as 301 and 302 redirects, 404 and 410 gone errors, and 503 temporary outages.