In this blog you will see how to remove the site collection from SharePoint Online using Powershell.
Syntax:
Connect-SPOService -Url https://c986-admin.sharepoint.com/ -credential [email protected]
Remove-SPOSite -Identity https://c986.sharepoint.com/sites/vijaitestsite
Output:
Specified site collection is removed but not deleted permanently and it will be moved to the Recycle Bin.