What is Trello?
It is hard to explain what Trello is with just one sentence. Trello is not one thing, but many things; infinite things. The best way I can explain Trello is by telling people that it is an online tool to help you organize, plan, and track anything and everything.
One of the reasons I love Trello is because of how versatile it is. There isn't one way to use Trello and you can organize it in any way that makes sense to you.