Arrhenius Persistent Compute and Data (PCD) is a national cloud service provided by NAISS that gives researchers in Sweden flexible access to computing resources for their work. It is designed to support projects that benefit from adaptable environments, such as developing new tools, testing ideas, or running data-driven applications. PCD complements traditional high-performance computing by offering a more customizable and accessible platform, helping researchers explore and innovate across a wide range of disciplines.