K-mesons, also known as kaons, are a type of subatomic particle that belong to the meson family. They are composed of a quark and an antiquark, specifically a strange quark and either an up or down quark. K-mesons come in several varieties, including K+, K-, and K0, each with different properties and lifetimes. These particles play a significant role in particle physics, particularly in the study of CP violation, which helps explain the matter-antimatter asymmetry in the universe. K-mesons are produced in high-energy collisions, such as those occurring in particle accelerators, and their decay patterns provide valuable insights into fundamental forces and interactions.