Overdrive is a company that sells digital eBooks to the public libraries of Westchester County. Libby is the name of the app created by Overdrive that you install on a mobile device to borrow and read eBooks from Overdrive.
Search for the WESTCHESTER LIBRARY SYSTEM when registering for an account.
Overdrive/Libby is ending support for the Windows version of the Libby app on December 7, 2020. Windows users can use Libby on their device in-browser at libbyapp.com.