Deepfakes are no longer just internet tricks or funny memes. They have become a serious security concern. Powered by artificial intelligence, deepfakes can create hyper-realistic videos, images, or voices that are almost impossible to distinguish from reality. From financial fraud to political misinformation and personal harassment, their impact is already being felt worldwide. Understanding how deepfakes work, the risks they pose, and the ways to defend against them is now essential for individuals, businesses, and society as a whole.