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localStorage and sessionStorage both have different scope.
sessionStorage is accessible only by the window which created it and only for that span of time while the window which created is open.
On the other hand, localStoarge is something which is available to the user even if user close the window and then open it again.
So main difference is the expiry of the values which are stored in these stoarge.
The only difference is that localStorage has a different expiration time sessionStorage will only be accessible while the window that created it is open. localStorage lasts until you delete it or the user deletes it
Session storage are data that resides on the server which client are accessing while the local storage are on the client storage and typically it is more faster on caching or accessing those files by an application.