The "80th percentile" is a statistical measure that indicates a value below which 80% of the data points in a dataset fall. For example, if you have a group of test scores, the score at the 80th percentile means that 80% of the students scored lower than that score, while 20% scored higher. This helps to understand how a particular value compares to the rest of the data. Percentiles are commonly used in various fields, such as education, health, and finance, to assess performance or distribution. For instance, in a standardized test, a student in the 80th percentile performed better than most of their peers, highlighting their relative achievement.