Youm-e-Takbeer is celebrated to commemorate historic nuclear tests Pakistan conducted on May 28 in 1998. This day is celebrated annually in Pakistan as Youm-e-Takbeer, which means the day of greatness, and as the National Science Day, to celebrate Pakistan’s scientific achievements. The day every year marks the anniversary of Pakistan’s first nuclear test. Pakistan successfully tested five nuclear devices as a direct response to a series of nuclear test explosions by India in 1998. This was a strong statement response to India’s test of nuclear weapons in an area of Rajasthan, Pokhran. India tested their first nuclear bomb in an operation code named “Smiling Buddha,” or Pokhran-I on May 18, 1974. The global power ambition of India created a security dilemma for Pakistan, and compelled Pakistan to acquire nuclear capabilities. On May 11, 1998 India tested five nuclear bombs. These tests were conducted at a time when conflict in Kashmir was once again escalating. The Indian explosions forced Pakistan to make a tough decision. On May 28, 1998, despite a huge amount of international pressure, Pakistan tested its nuclear devices as a direct response to Indian aggressive action. Pakistan after a successful nuclear test appeared on the map of the world as the seventh nuclear power of the world and first from the Muslim world. Many scientists including Chairman PAEC of that time Munir Ahmed Khan, Dr. Abdus Salam, Dr. Ishrat Usmani, Dr. Samar Mubarak Mundd, and Dr. Abdul Qadeer Khan played a very pivotal role in making Pakistan a nuclear power. Pakistan has proved itself to be a safe paradise for nuclear reactors as Pakistan reactors are ensured under IAEA safeguard and always acted sensibly avoiding arms race in the region and India’s hostile intention. Pakistan now behaves as a nuclear country and every citizen of Pakistan must never undermine the country’s strength.