Human-readable data format used for organizing data in a text file; stands for "YAML Ain't Markup Language;" may be used with JavaScript, Perl, PHP, Python, and Ruby programming languages; used by Ruby on Rails to connect to a database, typically named "database.yml"
Program(s) that open yml files
Mac / Windows: Any text editor
Information from FileInfo.com - The File Extensions Resource.
http://www.fileinfo.com/extension/yml
