IP spoofing is a technique used by hackers to gain unauthorized access to computers. It refers to the creation of Internet Protocol (IP) packets with a false source IP address to impersonate another computer system. In IP address spoofing, the attacker changes the source address in the outgoing packet header to make the receiving computer system think the packet is from a trusted source, such as another computer on a legitimate network, and accept it. IP spoofing allows cybercriminals to carry out malicious actions, often without detection, such as stealing data, infecting devices with malware, or crashing servers. IP spoofing is most frequently used in denial-of-service attacks, where the objective is to flood the target with an overwhelming volume of traffic, and the attacker does not care about receiving responses to the attack packets. To prevent IP spoofing, network administrators can use anti-spoofing measures such as ingress filtering, egress filtering, and source address validation.