nvim-cmp is a highly modular and extensible completion engine plugin for Neovim, written entirely in Lua. It provides a framework for registering completion sources (e.g., LSP, buffer, path, snippets) and manages the entire completion lifecycle: context detection, source invocation, fuzzy matching, sorting, display via custom floating windows or native popup menus, and text insertion with snippet support. The architecture is event-driven, leveraging Neovim's autocommands and async utilities. Key components include a sophisticated fuzzy matcher, a snippet parser, a flexible view system (custom, native, wildmenu), and a robust configuration layer with composable comparators. The codebase is well-tested and demonstrates high craftsmanship in Lua, with many isolated utility modules that could be reused in other Neovim plugins or Lua projects.