GEDCOM is an acronym for GEnealogical Data COMmunication. It is a common file format for exchanging data between genealogical record managers such as Family Tree Maker, Personal Ancestral File (PAF), Legacy Family Tree, Family Origins®, and others. If you use one of these (or a similar product), you can create a GEDCOM file containing your information.
A GEDCOM file can be uploaded, and the records it contains can be inserted into the OneGreatFamily tree. See "
How do I import my family tree from another genealogical program?". The function of creating the GEDCOM file is usually called "exporting" data. The result of exporting is a file such as "myged.ged". You can export your information from Genealogy Browser by selecting "Export from Current Individual to GEDCOM file" from the file menu.
GEDCOM in Glossary
Importing a GEDCOM
Exporting a GEDCOM