Project delays occur when a project does not progress according to its planned schedule. These delays can arise from various factors, including unforeseen circumstances, resource availability, or changes in project scope. When a project is delayed, it can lead to increased costs and affect the overall timeline for completion. Managing project delays involves identifying the causes and implementing strategies to mitigate their impact. Effective communication among team members and stakeholders is crucial to address issues promptly. Tools like Gantt charts and project management software can help track progress and adjust timelines as needed to minimize disruptions.