Financial institutions update their mortgage rates on many websites. Rate seekers can come to those websites looking for the updated mortgage rates on a daily basis. or you can subscribe to websites' RSS to get daily mortgage rate. RSS is a format for delivering a summary of web site content that changes on a regular basis. RSS formats are often used by news sites to syndicate news stories. Any site that has items that update often can use the RSS format to distribute information. Weblogs often use RSS to deliver updated information.