Recurrence refers to the repeated occurrence of events or phenomena over time. In various fields, such as mathematics and medicine, it can describe patterns that reappear, like the recurrence of a specific disease in a patient or the repetition of a sequence in a mathematical function. In statistics, recurrence can help analyze trends and predict future events based on past data. For example, in epidemiology, researchers study the recurrence of illnesses to understand their patterns and improve treatment strategies. Similarly, in time series analysis, recurrence helps identify cycles and trends in data sets.