'New-SPOSite' Not working.

Hello  All,

I am trying to execute "New-SPOSite" command, but its not working. Its showing following error :

Get-SPOSite : The term 'Get-SPOSite' 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
+ Get-SPOSite
+ ~~~~~~~~~~~
    + CategoryInfo          : ObjectNotFound: (Get-SPOSite:String) [], Command
   NotFoundException
    + FullyQualifiedErrorId : CommandNotFoundException