HTML is a Web format file. HTML source code can be changed in a text editor. HTML files are being developed for future use in the users web browser, allowing you to format text, images and other materials required sites. File with this format use tags to build web pages. HTML code is parsed Web browser and usually not visible to the user.
SVG is a markup language, scalable vector graphics, created by World Wide Web Consortium (W3C), designed for describing two-dimensional vector and mixed vector / raster graphics in XML. Supports both and animated, interactive graphics and declarative scripting. Not support the description of three-dimensional objects. The basis of SVG VML formed markup languages and PGML.