In the simplest terms, Azure DevOps is the evolution of VSTS (Visual Studio Team Services). It is the result of years of using their own tools and developing a process for building and delivering products in an efficient and effective way. But it's more than that, too. Think of it as VSTS, TFS (Team Foundation Server) and Azure all rolled up into one, with some improvements and a few extras. With Azure DevOps you get Azure Boards, Azure Repos, Azure Pipelines, Azure Test Plans and Azure Artifacts.