Hackers are criminals who gain unauthorized access to a network and devices, usually with the intent to steal sensitive data, such as financial information or company secrets. You can protect your computers by using firewalls and antivirus software and by following best practices for computer use. You can protect your mobile devices by turning off Bluetooth when it's not in use, being mindful of the Wi-Fi networks you connect to and using security applications to improve monitoring and protectio. A new threat known as computer hacking extended the definition of thievery to include infiltrating your computer, stealing personal information, tricking you into revealing private data, and using that data to steal and extort personal information, such as business secrets, bank account credentials and even people's identities. Computer hackers are people who break into internet-connected devices such as computers, tablets and smartphones, usua...