PPT is the legacy Microsoft PowerPoint presentation format used before PowerPoint 2007. It is a binary format that stores slides, including text, images, sound, and video. Like other legacy Office formats, it has been replaced by the XML-based PPTX but remains relevant for accessing older presentation archives. PPT sample files are used to test presentation software compatibility. Developers use them to check if slide transitions, animations, and embedded media from older files still function correctly in modern viewers. They are also used to test conversion tools that migrate legacy presentations to modern formats or PDF.