A snippet of HTML code that instructs a web browser on how to render a web page element. Tags are HTML’s workhorses, providing structure to otherwise unstructured text. Tags are labels that you create in Mailchimp to help you organise your contacts. Tagging allows you to import your own contact structure into Mailchimp and mark contacts with information that only you have access to. You can build and assign tags as you see fit because they are highly customisable. language of programming Tags were utilised for layout in the early days of the web, but modern web design relies on CSS to keep content and layout distinct. HTML tags and hashtags have nothing to do with each other.