In the field of computer security, security information and event management (SIEM) software products and services combine security information management (SIM) and security event management (SEM). They provide real-time analysis of security alerts generated by network hardware and applications. Vendors sell SIEM as software, as appliances or as managed services; these products are also used to log security data and generate reports for compliance purposes. The term security information event management (SIEM), coined by Mark Nicolett and Amrit Williams of Gartner in 2005,