The 2021 Taliban offensive was a military offensive by the Taliban insurgent group and allied militants that led to the fall of the Kabul-based Islamic Republic of Afghanistan and the end of the nearly 20-year War in Afghanistan that had begun following the United States invasion of the country. The Taliban victory had widespread domestic and international ramifications regarding human rights and proliferation of terrorism. The offensive included a continuation of the bottom-up succession of negotiated or paid surrenders to the Taliban from the village level upwards that started following the February 2020 US–Taliban deal.

The National Directorate of Security was the national intelligence and security service of the Islamic Republic of Afghanistan. The headquarters of the NDS was in Kabul, and it had field offices and training facilities in all 34 provinces of Afghanistan. The NDS was part of the Afghan National Security Forces (ANSF).