VRML (Virtual Reality Modeling Language) is a 3D vector format for defining interactive objects and environments. It was designed to be Web-friendly, but ultimately failed to be supported by most web browsers.
Despite the name, it is not related to virtual reality technology other than being a 3D format. For a time prior to its release, it was named Virtual Reality Markup Language.
There are two versions: VRML 1.0, and VRML97 (also known as VRML 2.0). VRML97 is standardized in ISO/IEC 14772-1:1997.
The successor to VRML is X3D.
The filename extension for uncompressed VRML files is .wrl (derived from the word "world").
WRL files are sometimes gzip-compressed. Such files may use an extension of .wrz, .wrl.gz, or may still use .wrl.
VRML 1.0 files begin with the ASCII string "
#VRML V1.0 ascii".
VRML97 files begin with the ASCII string "
#VRML V2.0 utf8".
(If the file is gzip-compressed, it must be decompressed first.)