The graph presented in this integrated reasoning question is a Multi-Line Chart. It's essentially a line chart, but has additional sets of data overlayed on top - each layer of data points is illustrated with a shape or color to differentiate itself.
The graph attempts to how units sold changes as time progresses. The time periods are measured in months.
One of the line charts is labeled "worldwide average" so it makes sense to compare the other line charts with this worldwide average. At first glance it looks like the other two sets of data (Widget Express and WidgetMania) both have higher units sold than the worldwide average for most of the 2012 time period.
There also appears to be some kind of seasonal effect where all sales are generally higher in a certain time of the year while sales are generally lower in otther parts of the year.
source: GMAT Pill - multi-line chart
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