• Homeland Security Threat Advisories contain actionable information about an incident involving, or a threat targeting, critical national networks or infrastructures or key assets. They could, for example, relay newly developed procedures that, when implemented, would significantly improve security or protection.  They could also suggest a change in readiness posture, protective actions, or response. This category includes products formerly named alerts, advisories, and sector notifications.  Advisories are targeted to Federal, state, and local governments, private sector organizations, and international partners.  
• Homeland Security Information Bulletins communicate information of interest to the nation’s critical infrastructures that do not meet the timeliness, specificity, or significance thresholds of warning messages. Such information may include statistical reports, periodic summaries, incident response or reporting guidelines, common vulnerabilities and patches, and configuration standards or tools.  It also may include preliminary requests for information. Bulletins are targeted to Federal, state, and local governments, private sector organizations, and international partners.
• Color-coded Threat Level System is used to communicate with public safety officials and the public at-large through a threat-based, color-coded system so that protective measures can be implemented to reduce the likelihood or impact of an attack.  Raising the threat condition has economic, physical, and psychological effects on the nation; so, the Homeland Security Advisory System can  place specific geographic regions or industry sectors on a higher alert status than other regions or industries, based on specific threat information.

 The following information provide the meaning of each color and the necessary steps needed to be prepared.