Have you ever mistakenly deleted a file that you did not wish to and wanted to restore again? You probably deleted it permanently with Shift + Delete or emptied the Recycle Bin. Now Don't worry, you may still have a chance to get it back.
When files and folders are deleted. It marks the storage space as empty for new data to be written and only deletes the index entry that tells the location of those files. Unless, new files are written on that space, the deleted files are still recoverable.