What are meta tags and why are they important for SEO?

If you've ever used a search engine, you'll be familiar with the titles and short descriptions that appear with every link in the search results. Chances are, you rely on these titles and descriptions to work out what's on each page and click based on which one you think is most relevant to what you're searching for. In the SEO world, these titles and descriptions are called meta titles and meta descriptions. Together, they're called meta tags. This video explains why meta tags are important for SEO.