One of the primary purposes of title and meta description tags is to control the information that is displayed in Search Engine Results Pages (SERP), the first (and possibly only) encounter that a potential visitor has with your website when using a search engine.
Optimising Title and Meta Description Length for Display in Google Search Results
The Title & Meta Description Tag
The title and meta description tags are two very important pieces of HTML markup that should be included on all pages of your website.
Managing Website Content: HTML & SEO Basics
Do you make regular updates to the written and visual content on your website? This is generally a good thing, but depending on exactly what it is that you're doing, and how you're doing it, there are some potential pitfalls.