Within this web statistics overview, you are being presented the most useful KPIs about your website's traffic, on a selectable timescale:
Traffic is the soul of your website. If there are visitors, there will be clients. Use this information to check how the performance of your website has reacted to actions that you took.
Just right above the graphs, there is a date selector, which enables you to choose a certain time range or even a day for which the data below should correspond to. It is important to constrain the date range to certain periods of time in which you ran potential campaigns or took other measures in order to measure how successful these actions were for future planning.
When you select the Compare to Previous Period radio button, a second line (lighter shade) will be added to all graphs. These lines will show data from the preceding time period before the one selected. As a result, if the chosen period to study is this week, the preceding period would be the same number of days but prior to the current week.
This will grant you the opportunity to see how your KPIs have developed over time.