In computing, a hyperlink, or simply a link, is a digital reference to data that the user can follow or be guided to by clicking or tapping. A hyperlink points to a whole document or to a specific element within a document. Hypertext is text with hyperlinks. The text that is linked is known as anchor text.

Heat Map

A graphical representation of web page engagement data using colours to indicate the level of activity. Low activity areas usually use darker blue through green colours to indicate low activity sections. Higher activity areas progress from yellow to orange to red colours to indicate increasing activity levels across different sections.


A clickable keyword that sums up the content of a tweet or social media status update. A hashtag is a dominant feature of both Twitter and Instagram.

Hard Bounce

A permanent failure to deliver an email to a recipient account, where any retries will not be successful.


A way to identify a person or brand on social media platforms. Handles are usually preceded by the @ symbol.

Hypertext Transfer Protocol Secure (HTTPS)

Hypertext Transfer Protocol Secure is an extension to the original Hypertext Transfer Protocol (HTTP). HTTPS uses encryption for secure communication over a computer network and is widely used on the Internet. In HTTPS, the communication protocol is encrypted using Transport Layer Security or, formerly, Secure Sockets Layer.