RSS feeds are used for syndicating regularly changing content on a web site, including this one. You can open an RSS feed using an RSS reader and use it to see if there is any new content on this site or you can set up a server-side script to parse the feed and display it on your web site.
Product search feeds allow you to save your custom product searches as syndication feed that will always update when there are new results.
To create a product search feed, perform a standard search on Antique shop Chano-yu and at the bottom of the page click on one of the syndication options.
All prices are in JPY