Require documents to be checked out before they can be edited settings in SharePoint document library

Have you always wondered why documents are checked out to you when you copy files to SharePoint document library from file explorer. It is because of the 'Require documents to be checked out before they can be edited' settings in Document library settings>General Settings>Versioning settings>Require Check out section. If it is set to 'Yes' new documents(in this case copied documents) are checked out to you. If it is set to 'No' then you can easily transfer files from windows file explorer.