A sparkline is a tiny, word-sized chart with no axes or labels, made to sit inline - in a table cell or next to a number - to show a trend at a glance.
When you want to show the shape of a trend in very little space - a row in a table, a KPI card - where a full chart would be too much and a single number too little.
Just a series of values. The sparkline draws their shape without axes, gridlines, or a legend.
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