Cryptojacking is a form of cybercrime where hackers secretly use someone else's computer or device to mine for cryptocurrencies, like Bitcoin. This process requires significant computing power, and the unauthorized use can slow down the victim's device and increase electricity costs. Hackers often achieve cryptojacking by embedding malicious code in websites or software. When users unknowingly visit these sites or download the infected software, their devices start mining for cryptocurrencies without their consent. This can lead to performance issues and potential security risks for the affected users.