Intro
YASnippet is a template system for Emacs. It allows you to type an abbreviation and automatically expand it into function templates. Bundled language templates include: C, C++, C#, Perl, Python, Ruby, SQL, LaTeX, HTML, CSS and more.
snippets
YASnippet no longer bundles snippets directly, but it’s very easy to get some!
yasnippet-snippets - a snippet collection package maintained by AndreaCrotti.
It can be installed with M-x package-install RET yasnippet-snippets if you have added MELPA to your package sources.