Zapier is a workflow automation software that allows users to create automated workflows called Zaps, which send information from one app to another without coding knowledge required. The tutorial guides on how to build a no-code automated workflow using Zapier to add every new Microsoft Outlook event to Todoist tasks. To set up the workflow, users need to create a trigger in Microsoft Outlook and an action in Todoist, connecting their accounts to Zapier if necessary. The tutorial provides step-by-step instructions on customizing the action fields, such as title, note, project, due date, labels, and priority, to ensure seamless integration between Microsoft Outlook and Todoist. By following this guide, users can keep all scheduling information in sync across both apps, streamlining their daily and weekly organization.