Online Analytical Processing (OLAP) is a technology that enables users to analyze large volumes of data quickly and interactively. It allows for complex calculations, trend analysis, and sophisticated data modeling, making it easier for businesses to gain insights from their data. OLAP systems often use a multidimensional data model, which organizes data into cubes, allowing users to view it from different perspectives. OLAP is commonly used in business intelligence applications, where decision-makers need to explore data for reporting and analysis. By providing fast query performance and the ability to drill down into data, OLAP helps organizations make informed decisions based on historical and current data trends.