Meta Tags are HTML tags hidden within the header of a web page. These tags contain information about your page. For example: a title, a brief description, and images.
When a social media channel receives a URL, behind the scenes it goes to this URL to try and gather information about this page. While most channels do their best to figure out what title or image to display from the page itself, we can be more explicit by setting up meta tags. If these meta tags are present, the channel will use them first.