Title tag is what appears to the user on the search engine result page as a clickable link. Title tags give the user an idea of the content of your website, thus affecting the number of clicks on your website link.
Meta tags on the other hand, appear only in the HTML of the web page and is visible only to the search engine. However, the meta tags must be carefully used as it affects the search engine result by describing to the search engine crawler what the web site is about and what your content includes.