The principle of familiarity in social engineering attacks leverages the human tendency to trust and feel comfortable with people or situations that seem familiar. Attackers employing this principle exploit the victim's desire for familiarity by imitating known individuals, brands, or established communication channels. By creating a false sense of familiarity, attackers aim to lower the victim's guard, increase trust, and manipulate their behavior. This can lead the victim to share sensitive information, click on malicious links, or perform actions they would typically do in familiar contexts.