XVim is a tool that allows users to add Vim keybindings and functionality to Xcode, a popular integrated development environment for iOS application development. XVim enables users to experience the modal text editing of Vim within Xcode, making it easier to navigate and edit code. To use XVim, developers must first prepare a certificate for code signing, which involves creating a digital certificate through Apple's developer program. Once this is done, users can build XVim by cloning the GitHub repository, compiling it with `make`, and customizing their `.xvimrc` file to suit their preferences. With XVim, developers can now enjoy the benefits of Vim's modal editing within Xcode, making development more efficient and enjoyable.