openssl is not recognized

Open SSL is not recognized in Windows. 

openssl : The term 'openssl' is not recognized as the name of a cmdlet, function, script file, or operable program.

Check the spelling of the name, or if a path was included, verify that the path is correct and try again.

At line:1 char:1

+ openssl req -newkey rsa:2048 -nodes -keyout key.pem -x509 -days 365 - ...

+ ~~~~~~~

    + CategoryInfo          : ObjectNotFound: (openssl:String) [], CommandNotFoundException

    + FullyQualifiedErrorId : CommandNotFoundException

Solution: Install the openssl or use any unix command line tool that is install in your machine. e.g. Unix, Git