You already know threads
You have already seen threads in some form in your life. Standing in a queue at the store or having a conversation with someone via email and replies – all those are threads. A queue is just a "thread of people". A 'channel' in a chat application is just a thread of messages, going back and forth. And an "email thread" is ... well, a thread of emails (aka conversation thread with lots of ‘Re:’s in the subject). What you probably have not seen is a queue of people and orangutans. They aren't common, but they do exist. We call these threads 'multi-mode’ because they have different types of objects/entities/whatever in the same thread. Why is this important? Because we use this “multi-mode” concept in Clariti threads. You see, our threads are 'smarter' - and contain chats, emails, documents, to-dos, calls.