Portable Document Format (PDF) is a type of document created by Adobe back in 1990s. The purpose of this file format was to introduce a standard for representation of documents and other reference material in a format that is independent of application software, hardware as well as Operating System. PDF files can be opened in Adobe Acrobat Reader/Writer as well in most modern browsers like Chrome, Safari, Firefox via extensions/plug-ins.
DAEDigital Asset Exchange File Format
A DAE file is a Digital Asset Exchange file format that is used for exchanging data between interactive 3D applications. This file format is based on the COLLADA (COLLAborative Design Activity) XML schema which is an open standard XML schema for the exchange of digital assets among graphics software applications. It has been adopted by ISO as a publicly available specification, ISO/pAS 17506.