As part of Microsoft's 2007 suite another open XML document type was introduced. This time in the PowerPoint sphere, PPTX is a Presentation format that stores slides used for slide shows or presentations; like a normal PPT format it may include text, images, and other media; however PPTX is based on the Open XML format and uses ZIP compression for smaller file sizes
A PPTX file is quite unique. The specifications for PPTX are in the ECMA-376 standard for Office Open XML. You can make a PPTX file by zipping up a directory, but the material in the directory has to match an OPC structure, including subfolders that have the content in XML format. Any application that supports XML can access and work with data in the new file format. Just like the DOCX file format, PPTX improves file and data management and data recovery.
ODP is one of many formats that were born from the Open Office Project. The project was initiated by Sun Microsystems as an answer to the ever rising demand for free office applications. There are many applications that have bought into this, including KOffice and Neooofice. ODP is used by Open Document Presentation files that are created by the OpenOffice software suite. Open Document Format is XML based and therefore easily portable.
ODP files can be opened and edited on applications whose standards are in conformity to the OpenDocument format. The Impress presentation application that comes with StarOffice from Sun Microsystems (now Oracle) can also render ODP files in a similar fashion to OpenOffice. As it's open source, any user can modify the source code to enhance the application and later on publish their modified copies for public consumption.