Look-Up Tables

A Look-Up Table (LUT) is a data structure used in computing to quickly find and retrieve pre-calculated values instead of calculating them on the fly. Think of it as a reference chart: you input a value or index, and the LUT immediately provides the corresponding output. This approach saves time and resources, especially in tasks like graphics processing, data transformation, or simulations, where rapid calculations are essential. In essence, LUTs streamline processes by storing a set of ready-made answers, allowing computers to work more efficiently.