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+# [Layers](https://spacevim.org/layers) > autocomplete
+
+SpaceVim uses neocomplete as the default completion engine if vim has lua
+support. If there is no lua support, neocomplcache will be used for the
+completion engine. Spacevim uses deoplete as the default completion engine
+for neovim. Deoplete requires neovim to be compiled with python support. For
+more information about python support in neovim, please read neovim's documentation `:h provider-python`.
+
+SpaceVim includes YouCompleteMe, but it is disabled by default. To enable
+ycm, see `:h g:spacevim_enable_ycm`.
+
+SpaceVim use neosnippet as the default snippet engine. The default snippets
+are provided by `Shougo/neosnippet-snippets`. For more information, please read
+`:h neosnippet`. Neosnippet support custom snippets, and the default snippets
+directory is `~/.SpaceVim/snippets/`. If `g:spacevim_force_global_config = 1`,
+SpaceVim will not append `./.SpaceVim/snippets` as default snippets directory.
+
+## Key Mappings