The International Genealogical Index (IGI) was a precursor to FamilySearch indexing. The index contains two kinds of information:
Community Indexed IGI. Information transcribed from various historical documents from many countries and organizations. It tends to cover the time frame of the early 1500s to 1885. In November of 2014, FamilySearch added the community indexed IGI records as sources to Family Tree. If you click a source title, you can see a yellow box with this message, “This extracted IGI record was used to create this person.” Search the index at https://www.familysearch.org/search/collection/igi.
Community Contributed IGI. Information derived from family records submitted to The Church of Jesus Christ of Latter-day Saints by its members. The members gave the best information available at the time. However, the data is not documented. Before you rely on it, you should carefully review the data and find sources to verify it. Search the Community contributed IGI from FamilySearch Genealogies.
How do I search the indexed International Genealogical Index (IGI)?
What does "This extracted IGI record was used to create this person" mean?
How do I find the original image for a record in the indexed International Genealogical Index (IGI)?
How do I search the pedigree resource file and other genealogies?