A cyber-attack in cybersecurity refers to deliberate actions taken by individuals or groups to compromise computer systems, networks, or digital devices. These attacks aim to steal, alter, destroy, or ransom data, disrupt operations, or otherwise harm victims. Cyber-attacks exploit vulnerabilities in software, hardware, or human behavior to achieve their goals. Methods range from malware infections and phishing campaigns to denial-of-service attacks and advanced persistent threats. The motivations behind these attacks vary, encompassing financial gain, espionage, political agendas, or simple notoriety. With the increasing digitization of services and daily life, the impact and frequency of cyber-attacks have grown. Protecting against them requires a combination of technical solutions, regular updates, and user education. Organizations and individuals must remain vigilant and adaptive to counter the evolving cyber threat landscape.