Scope creep refers to the gradual expansion of a project's goals and deliverables beyond its original plan. This often occurs when new features or requirements are added without proper evaluation or approval, leading to increased costs and extended timelines. It can happen in various fields, including software development and construction, where stakeholders may request changes that were not part of the initial agreement. Managing scope creep is essential to ensure that projects stay on track and meet their objectives, often requiring clear communication and documentation among all parties involved, including project managers and clients.