In text messaging, emailing, and other forms of private online communication, a thread is a way of grouping messages pertaining to the same conversation. An example of this is when a group of emails are organized in a way that allows each message to appear individually instead of duplicating the entire message chain that preceded it. Similar threads appear in online messaging platforms such as Slack or Apple’s iMessage, where a user can create a new thread by responding to another user’s message. Read More.