The term ""Thermal High Altitude Area Defense"" sometimes mentioned in news, refers to

The term "Terminal High Altitude Area Defense" (THAAD), often misspelled as "Thermal" in some contexts, refers to a sophisticated American anti-missile system [2]. Developed by Lockheed Martin, THAAD is a mobile, ground-based ballistic missile defense system designed to intercept and destroy short, medium, and intermediate-range ballistic missiles during their final or terminal phase of flight. It utilizes "hit-to-kill" technology, where kinetic energy from a direct impact neutralizes the incoming threat either inside or outside the atmosphere [2]. The system is a critical component of a layered defense strategy, complementing other systems like the Patriot and Aegis. It is highly regarded for its accuracy and ability to defend large areas against missile attacks, as evidenced by its deployment to various global regions to bolster regional security.

Sources

1. [1] https://en.wikipedia.org/wiki/Terminal_High_Altitude_Area_Defense
2. [2] https://www.congress.gov/crs-product/IF12645