Today¿s new reality is that the world faces terrorist attacks every day from either domestic, homegrown violent extremists, or international terrorists. The purpose, as security professionals, is to safeguard the people, property, and places that the service is hired to protect. This lesson is broken into four major sections: Government Agency Overview, International Terrorism, Domestic Terrorism/Homegrown Violent Extremism, and Defense Strategies.Every security post has different attack vectors. Depending upon the venue, the client, and the material under protection, the post may attract the attention of different terrorist groups. For this reason, it is important to understand the largest and most active terrorist groups, the methods and goals. With this understanding, steps can be taken to harden post defenses. Awareness is always the first line of defense.