Definition: In the context of computer science, "pretreats" refers to a process that involves modifying or manipulating a piece of data before it is used in an algorithm. This can include removing certain elements from the data set, changing its values, and applying transformations like sorting, filtering, etc. For example: ```python # pretreating a list data = [1, 2, 3, 4, 5] prettied_data = sorted(data) print(prettied