Yes they are stored there in case you find some files shouldn't be there, antivirus systems usuall refer to the folder as a vault or quarantine. If you run windows defender and select the history tab you will see a label "quarantined items". Select that and click on the "view details" button towards the bottom. This will show all items in quarantine. You may then select "remove all" or just "remove" to delete selected items. But do make sure you want to remove them before doing so.