You don't need to install this unless another app needs it. ChartDroid is an Intent-based "library application" for static chart and graph generation on Android. Other applications can use it to graph/plot/display numerical data in many representations by implementing a ContentProvider according to this simple specification (https://code.google.com/archive/p/chartdroid/wikis/InterfaceSpecification.wiki). ChartDroid is consistent with the "Unix toolkit" philosophy of building small, interoperable tools. Having ChartDroid exist as an independent application (as against being an importable .jars library) conserves storage space and eliminates redundant code.