Window opening time refers to how often the calculation is performed
Sliding time refers to how long the previous data is covered by one calculation
The rolling window means that the window opening time is equal to the sliding time. At this time, the data is processed in a normal sequential timeline, and the timeline will not overlap, and the data will not be lost in theory.
Sliding window generally means that the sliding time is greater than the window opening time. On the time line, there is time overlap, and the data will be repeated every time.
In some special cases, there will be a sliding window with a sliding time less than the window opening time, but it is rare, and it is usually done when sampling data.