Nuclear weapons are powerful explosive devices that release energy through nuclear reactions. They can cause massive destruction and loss of life in a very short time. The two main types of nuclear weapons are atomic bombs, which use fission (splitting atoms), and hydrogen bombs, which use fusion (combining atoms). These weapons are often associated with military power and global security concerns. The use of nuclear weapons has been a significant topic in international relations since their first use in World War II. Countries with nuclear capabilities, like the United States and Russia, engage in treaties to prevent their spread and promote disarmament. The threat of nuclear warfare remains a critical issue in today's world.