Cryptojacking is the unauthorized use of your device e.g. computer, smartphone or tablet for mining cryptocurrencies. The most intriguing part is that you might completely remain unaware of your system being used as a cryptocurrency mining device. It is designed in such a way that it remains hidden from the user. The user might experience high CPU usage, slowness and overheat of the system without even realizing that the system is being used by someone else to mine cryptocurrencies.