An algorithm is a set of defined steps or rules for solving a problem or completing a task. It serves various purposes across computer science and mathematics, optimizing processes by providing efficient methods for data processing, analysis, and decision-making. Algorithms are essential for enabling software applications to perform functions, such as sorting data, searching databases, or executing complex calculations. In AI, algorithms drive machine learning models, facilitating predictive analytics and enhancing user experiences. Ultimately, algorithms are fundamental to technology, underpinning the operations of countless applications and systems.