"Rapidly" refers to the speed at which something occurs or changes. It indicates a quick pace, often implying that an event or process happens in a short amount of time. For example, a cheetah can run rapidly, reaching speeds of up to 60 miles per hour in just a few seconds. In various contexts, "rapidly" can describe changes in technology, such as the internet evolving rapidly over the past few decades. It can also apply to natural phenomena, like a storm developing rapidly, which can lead to severe weather conditions.