Estimating and planning are essential processes in project management that help teams define the scope, resources, and timeline of a project. Estimating involves predicting the time, cost, and resources needed to complete tasks, while planning organizes these estimates into a structured approach to achieve project goals. Effective estimating and planning ensure that projects stay on track and within budget. Tools like Gantt charts and project management software can assist in visualizing timelines and resource allocation, making it easier for teams to communicate and collaborate throughout the project lifecycle.