With Microsoft Office 2007, the .PPTX file format was introduced in addition to the .PPT format. They both store presentation information such as text, images, graphics, audio, animation, slide transitions, and more.
PPT is a binary file format. PPTX, on the other hand, uses the Open XML standard and ZIP compression. This makes the PPTX format easier to use, provides better data management, and improves file recovery.