High-level and low-level are terms used in classifying levels of description and goals in many fields where systems could be described from different perspectives. A high-level description is one that is more abstracted, describes overall goals and systemic features, and is typically more concerned with the system as a whole, or larger components of it. A low-level description is one that describes individual components, provides detail rather than overview, rudimentary functions rather than complex overall ones, and is typically more concerned with individual components within the system and how they operate.