Trello is a visual collaboration tool that uses boards, lists, and cards to organize projects and tasks using the Kanban methodology. Owned by Atlassian since 2017, Trello serves over 50 million users worldwide for project management, team coordination, and personal productivity. The platform's flexibility lies in its Power-Ups (integrations), Butler automation, and multiple view types (Board, Timeline, Calendar, Table, Dashboard), making it adaptable from simple to-do lists to complex multi-team workflows. A key insight: Trello's true power emerges not from boards alone, but from strategic automation and view switching — teams that master Butler rules and leverage the right view for each task type typically see 40-60% faster project completion.