Convert blend to x3d

What is the difference between .blend and .x3d?

Description: Blend is a 3D format developed by the Blender 3D modelling application to describe 3D scenes. The file may also contain sound, scenes, and effects used in animation.; X3D (Extensible 3D) is a royalty-free open standard file format used to represent 3D computer graphics. It is used to store and interchange 3D model data, including surface geometry, color, animation, and metadata. X3D files are built on the XML standard, and can be viewed and edited with a variety of 3D modeling programs.