Axions are hypothetical particles that scientists believe could help explain some of the mysteries of the universe, particularly dark matter. They were first proposed in the 1970s as a solution to a problem in particle physics related to the strong nuclear force. If they exist, axions would be extremely light and weakly interacting, making them difficult to detect. Researchers are actively searching for axions using various experiments and technologies. If discovered, axions could not only shed light on dark matter but also provide insights into fundamental questions about the nature of matter, energy, and the universe itself.