Zapier is a workflow automation software that allows users to create automated workflows called Zaps, which send information from one app to another without needing coding knowledge. The platform offers templates and user interfaces to build and automate anything imaginable. A specific Zap helps create new Trello cards every time a message is saved in Slack, allowing for instant task tracking without context switching between apps. By setting up this Zap, users can streamline their workflow and enhance productivity.