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Secure Shell (SSH) is a cryptographic network protocol for operating network services securely over an unsecured network. By default, this optional way for another device to see your PI is turned off. You can turn it on by the configuration application on your Pi, but you may want it turned on as your Pi boots up and you can do that by adding a file to your micro-SD card.
The file must be named "SSH" with those three letters in capitals, but with no file extension and no contents. On a Windows PC, if you right click (while viewing the boot directory on the card) there is an option called '''New''' and if you select ''a text file'' it will create an empty file with the extension '''.txt'''. (In windows there is an option to hide extensions which is on by default, so you may need to deselect this option ['''New''' menu -> ''Options''] to see this extension). On Windows you can open the file using Notepad to verify it is empty, if you gave accidentally created a file of another type like word processing it will be full of characters some of which do not display. Anyway, you must remove any extension from the file name so it is really just '''SSH'''. Type into the file <tt>touch ssh</tt>, but nothing else, no empty lines, no end of line characters.
When the card is inserted into your Pi, on boot this file will be removed and the SSH option will be enabled.
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