The source provides an extensive overview of the evolution of the Linux display stack, focusing on the historical X Window System (X11) and its modern replacement, Wayland. It details the client-server architecture of X11, noting its legacy complexity, security flaws, and the eventual transition to a compositor-driven model, which made the X server redundant. In contrast, Wayland is presented as a minimal, more secure protocol that unifies the roles of the display server and compositor, allowing applications to render content directly to shared buffers for improved performance and reduced latency. Finally, the text explores how complex applications like Google Chrome (Chromium) manage this duality by utilizing abstraction layers like Ozone and Aura to maintain a unified rendering and input pipeline across both X11 and Wayland environments, often relying on the compatibility layer XWayland for older applications.