Spoofing is a malicious practice where cyber thieves falsify information to steal people's personal details like banking credentials and passwords. It is classified into spoofing IP addresses, ARP, DNS, websites, emails, and GPS. Spoofing often occurs on porn sites, game sites, bank pages, and ads. The document provides 10 rules for staying safe online, such as not sharing passwords, avoiding unknown links, keeping devices updated, and having parental controls.