GEDCOM

0 HEAD
1 SOUR PAF
2 NAME Personal Ancestral File
2 VERS 5.0
1 DATE 30 NOV 2000
1 GEDC
2 VERS 5.5
2 FORM LINEAGE-LINKED
1 CHAR ANSEL
1 SUBM @U1@
0 @I1@ INDI
1 NAME John /Smith/
1 SEX M
1 FAMS @F1@
0 @I2@ INDI
1 NAME Elizabeth /Stansfield/
1 SEX F
1 FAMS @F1@
0 @I3@ INDI
1 NAME James /Smith/
1 SEX M
1 FAMC @F1@
0 @F1@ FAM
1 HUSB @I1@
1 WIFE @I2@
1 MARR
1 CHIL @I3@
0 @U1@ SUBM
1 NAME Submitter
0 TRLR

GEDCOM (/dʒɛdkɒm/ JED-com) (an acronym standing for Genealogical Data Communication) is an open de facto specification for exchanging genealogical data between different genealogy software. GEDCOM was developed by The Church of Jesus Christ of Latter-day Saints (LDS Church) as an aid to genealogical research.

A GEDCOM file is plain text (usually either ANSEL or ASCII) containing genealogical information about individuals, and meta data linking these records together. Most genealogy software supports importing from and exporting to GEDCOM format. However, some genealogy software programs incorporate the use of proprietary extensions to the format, which are not always recognized by other genealogy programs, such as the GEDCOM 5.5 EL (Extended Locations) specification.

While GEDCOM X and several other specifications have been suggested as replacements, the current 1996 version remains the industry standard 20 years on.

GEDCOM uses a lineage-linked data model. This data model is based on the nuclear family and the individual. This contrasts with evidence-based models, where data is structured to reflect the supporting evidence. In the GEDCOM lineage-linked data model, all data is structured to reflect the believed reality, that is, actual (or hypothesized) nuclear families and individuals.