You look at it, find the specific year you want, and there should be a little bubble above or below the year telling you facts about the year.
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They both use numbers.
A line graph because time is a continuous variable
Yes, but most of the time we use intervals of 1.
A historian would use a timeline to establish the order events happened.
You use a line chart to show changes over time, for the same value. The line goes up or down, depending on the change over time. A column chart is more commonly used to compare independent values.