A hydrogen bomb is worse than a nuclear bomb.
Hydrogen bombs are also known as a thermonuclear bomb and is considered to be worse than a traditional nuclear or fission bomb.
Both hydrogen bombs and nuclear or fission bombs are still both incredibly destructive although hydrogen bombs can be much more powerful and destructive due to their reliance on fusion reaction in addition to the fission.
Hydrogen bombs use both fission which is the splitting of atoms and fusion which is the fusing of atoms to create their explosive force which allows them to achieve much higher yields than fission based atomic bombs and sometimes as much as 1,000 times more powerful.
The larger explosions of hydrogen bombs mean that the blast, heat and the radiation also effects have a wider reach, causing more widespread destruction and devastation.
Both nuclear bombs and hydrogen bombs produce radioactive fallout, although hydrogen bombs can also have a cleaner explosion, with less fallout if a significant portion of their yield comes from fusion.
The US has dropped a hydrogen bomb but only in testing scenarios and not for actual war.
Hydrogen bombs have been detonated but primarily in testing scenarios and not in actual war.
The first successful test of a hydrogen bomb was performed and conducted in 1952 by the United States as part of Operation Ivy.
The Soviet Union also followed with their own tests in 1953.
The hydrogen bomb tests by the Soviet Union and the United States involved large scale detonations to demonstrate the power of the hydrogen bombs but were not actually used in warfare.
The US test during operation ivy, code named "Mike," was conducted on November 1st 1952 at Enewetak Atol in the Marshall Islands.
The test was the first to use the Teller-Ulam design, which was a staged fusion device and was also a major milestone in development of thermonuclear weapons.
And then following the Soviet tests and the United States tests, other nations such as the United Kingdom as well as China and France also developed and tested out hydrogen bombs as well.
In 1961 the Soviet Union also conducted a test of the Tsar Bomba which was the largest and also most powerful nuclear weapon that was ever detonated.
And although despite these tests that were done the hydrogen bombs were never and have never been used in war or combat.
The development and the testing of these bombs and weapons were mainly driven by the Cold War and also the concept of nuclear deterrence in which the treat of massive retaliation is intended to prevent any aggression.
Although the existence of these powerful bombs and weapons also continues to remain a huge concern for global security and efforts are still ongoing to reduce nuclear stockpiles and prevent any proliferation.