ODP is the native text file format from the OpenOffice office suite (or Apache OpenOffice). The format was developed by Sun Microsystems. Its name is an abbreviation for OpenDocument Presentation. The ODP extension is commonly used to create presentations. To create ODP files, the open XML standard OASIS OpenDocument is used. Since 2010, the popular Microsoft PowerPoint program can also work with ODP files. A presentation in ODP format can exist in the form of a set of slides, which include text (including formatted), graphics, various effects.
PDF is short for Portable Document Format, which can be translated from English as “Portable Document Format”. It was developed by Adobe Systems for use by US federal authorities as a tool for storing working documents. This is a universal cross-platform format, which is now standard for electronic documents. It serves to convert text files (including photographs or other images) into electronic documents without any loss. To read PDF files you need special programs - Adobe (Acrobat) Reader, PDF-Viewer and others.