The GEDCOM Standard Release 5.5 "GEDCOM was developed by the Family History Department of The Church of Jesus Christ of Latter-day Saints (LDS Church) to provide a flexible, uniform format for exchanging computerized genealogical data. GEDCOM is an acronym for GEnealogical Data Com munication. Its purpose is to foster the sharing of genealogical information and the development of a wide range of inter-operable software products to assist genealogists, historians, and other researchers."
Well, as I tried to explain GEDCOM is a de-facto standard format that any family tree program can use. Once I enter data in, you can use your favorite family tree program to view the data I send you as a GEDCOM file.