If you've ever had to view PDF documents, there's a good chance you're already very familiar with Adobe's Acrobat Reader. After starting off on Windows and Mac platforms back in the 1990s, Acrobat Reader arrived on Android devices in 2010. Even after the arrival of plenty of competing options, Acrobat Reader has managed to remain popular and has now hit a milestone of over 500 million installs on the Play Store.
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