Vim is a text editor with different modes including command mode, insert mode, and visual mode. It has basic movement commands like hjkl and commands for inserting, deleting, copying, pasting, finding, replacing, opening files, and more. Configuration of Vim is done through a vimrc file where you can enable syntax highlighting, set indentation, and detect filetypes among other options. Popular Vim plugins include Pathogen, Nerd Tree, Nerd Commenter, and Ctrlp.vim.