A constraint, or limitation, refers to a restriction that affects the ability to achieve a goal or complete a task. Constraints can arise from various sources, such as time, resources, or regulations. For example, a project may be limited by a tight deadline, which can impact the quality of the final product. In many fields, understanding constraints is crucial for effective planning and decision-making. In engineering, for instance, designers must consider material limitations and safety regulations when creating structures. Similarly, in business, financial constraints can influence strategic choices and operational efficiency.