You’ll find your web page’s meta description tag in the header section of the source code.
Meta descriptions are used to describe a page’s content to searchers and search engines accurately, clearly and succinctly. If you’re clever the link will also act as a powerful little text advert that people are inspired to click on. But that’s another story.
Search engines love new stuff. Change your meta description regularly and Google & co will keep checking out your website to see what you’re up to. One more small thing on a long list of things to do that’ll keep your site fresh and exciting for everyone concerned: spiders, bots and humans.