Trello is a task management app that gives you a visual overview of what is being worked on and who is working on it. It used the Kanban system, which was developed in Toyota as a system to keep production levels high and maintain flexibility. It is best represented as a whiteboard filled with post-it notes
The Trello uses the internal API to create and manage the board, list and cards
When making any API request to Trello, you will need to include your API key, along with an oauth token that was generated using your key.
https://api.trello.com/