Neovim is a modern text editor evolved from Vim, often called a PDE (Personalized Development Environment) rather than an IDE. The author uses Neovim with tmux for various tasks including data engineering, SQL queries, and writing. The setup includes features like database querying (vim-dadbod), LSP integration, git support, and markdown preview. While powerful for programming, the author prefers Obsidian for note-taking due to better support for backlinks, images, diagrams, and plugins. Neovim requires more initial setup but offers complete customization and long-term sustainability, similar to self-hosting versus using blogging platforms.