Hydrogen embrittlement is a phenomenon that occurs in metals and alloys when they become brittle due to the presence of hydrogen atoms. Other terms that can be used to describe this phenomenon include hydrogen-induced cracking, hydrogen stress cracking, and hydrogen-assisted cracking. Additionally, some sources use the terms hydrogen damage or hydrogen degradation to refer to the effects of hydrogen on the mechanical properties of metals. Regardless of the terminology used, the impact of hydrogen embrittlement on the performance and reliability of materials can be significant, making it an important area of research and development in materials science and engineering.