Suppose you are a soccer journalist in a newspaper and you missed an important match because you were getting married at that time. How would you write the next day's report?
If you watch the highlights to watch only the goals, you are doing Descriptive Analytics.
If you are referring to the full recording of the match from time to time, in addition to watching the highlights, to analyze what were the reasons for those goals, you are doing Diagnostic Analytics.
If you watch the full recording of the match with an objective to identify patterns in one team's general strategy, you are doing Predictive Analytics.
If you watch the full recording of the match multiple times to figure out what should be the other team's counter-strategy in the next match against the same team, you are doing Prescriptive Analytics.
If your newlywed partner doesn't let you watch any of the above, you are doing chores.