A "95% confidence level" is a statistical term that indicates how certain we are about a result. When researchers say they have a 95% confidence level, it means that if they were to conduct the same study 100 times, they would expect the results to fall within a certain range 95 times out of 100. This range is often represented by a confidence interval. This concept is commonly used in fields like science, medicine, and social research to assess the reliability of data. A higher confidence level, such as 99%, indicates even greater certainty, but it may also result in a wider confidence interval, making the results less precise.