Meta tags are HTML tags used for providing information about a page or website. The information conveyed by these meta tags, as such, cannot be specifically read directly on the page, but it is used by search engines and other websites as a reference in the case of content and intent of that particular page. Meta tags include title tags, meta descriptions, and meta keywords (most of which are now invalidated). They play a significant role in SEO in terms of information that provides search engines with indexing and ranking options for web pages.