Definition
The 'weak interaction,' also called the weak force, is one of the four fundamental forces of nature. It's responsible for radioactive decay and certain types of nuclear fusion. It's 'weak' compared to the strong force and electromagnetism, but it's still essential for the structure of matter. It governs the interactions of subatomic particles and helps explain how the sun shines. Think of it as the behind-the-scenes force that subtly transforms matter.