Gantt charts are a visual representation of project schedules, allowing users to view project names, deadlines, milestones, tasks, resources, and dependencies. They provide an improved visual overview, ergonomic project management, better resource management, real-time changes and agility, and steps to planning a project with automation capabilities. Gantt charts can be used by various industries and project management methodologies, making them adaptable and versatile tools for managing projects of any size or complexity. By leveraging Gantt charts in conjunction with Zapier, users can automate workflows, streamline processes, and increase productivity.