A terrorist organization is a group that uses premeditated, politically motivated violence or the threat of violence against non-combatant targets to create fear, coerce governments, or destabilize societies for ideological, religious, or political goals, often involving planning and material support for such acts. While no single universal definition exists, core elements include violence, political aims, targeting civilians, and inducing terror.
Key Characteristics:
Violence/Threat: Involves acts of violence or the threat of violence.
Political Motivation: Driven by political, ideological, religious, or social aims.
Non-Combatant Targets: Attacks civilians or others not directly involved in hostilities.
Intent to Create Terror: Aims to instill fear in the public or specific groups to achieve goals.
Organized Structure: Can range from loosely organized cells to more formal hierarchies.

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The above is the USA DOD definition... Not something I wrote.