A permlink, also called permalink, is a permanent link to a specific piece of content that will remain unchanged. When a piece of content is posted by an author on the Steem blockchain, a
root_permlink is created to allow for all front-end applications to display the content of the blockchain regardless of the root domain. The permlink is created via the original title of a post. Once created, it cannot be changed.
When a reply or comment is added to a a post, a permlink is created by adding a string of numbers and letters to the
root_permlink. This string is made of information such as the date, time and other unique identifiers.