Snippet – the compressed information on the site page presented by search system in delivery page. Snippets are created with the help meta-tag description. If given meta-tag is absent on a site, then SE analyzes the text and gives out the most relevant piece of the text as a snippet. This meta-tag does not influence on site ranging, but snippet plays very important role in the formation of opinion about a site. The user makes the decision – «either go on a site or do not» on a basis of meta-tag Title and Description.
Error while you are drawing up a snippet is saturation by its keywords.