"Fast" refers to a high speed or quickness in movement or action. For example, a cheetah is known as the fastest land animal, capable of reaching speeds up to 60 miles per hour in short bursts. In everyday life, people often describe activities like running, driving, or even typing as fast when they are done quickly. In technology, "fast" can describe the speed of processes or data transfer. For instance, a fiber optic internet connection is considered fast because it allows for rapid downloading and streaming of content. Overall, "fast" is a relative term that can apply to various contexts, emphasizing efficiency and speed.