WordPress's XML-RPC feature allows external services to access and modify content on the site. Common example of services that make use of XML-RPC are <a href="%1$s">the Jetpack plugin</a>, <a href="%2$s">the WordPress mobile app</a>, and <a href="%3$s">pingbacks</a>. If the site does not use a service that requires XML-RPC, select the "Disable XML-RPC" setting as disabling XML-RPC prevents attackers from using the feature to attack the site.