By data shredder I mean deleting data on a re-writable storage medium beyond recovery by normal methods. You might have heard of recovery of deleted files using special software, similarly, there are software available to delete data/files rendering them unrecoverable.
Many times we run into situations where we are required to use a public or a friend’s computer for work or personal work, like paying bills, buying stuff online etc, with this comes a privacy problem of privacy where you might accidentally leaving browsing/download history, login cookies (i.e. remember me/stay signed in etc) or chances of browsers saving form data & passwords. Private browsing or Incognito mode as some browsers feature it is the answer to the problem.