A computer exploit usually refers to vulnerability on software through which hackers can gain access to data. Usually, users are not even aware that such vulnerabilities exist and this puts them in a very precarious position. The problem is generally fixed by the developers, and they avail the safer software through updates. It is therefore incumbent upon the user to install updates to their software as soon as they are released.
As a safe measure, avoid downloading attachments from suspicious sources as they might just be what the hackers need to access your data. It is only by being vigilant and staying up to date that you can protect your data from unwanted access. You will also do yourself a great favor by installing a premium anti-virus program on your devices as it will keep the hackers at bay. Be sure to visit www.norton.com/setup for more information on how to go about this.