The document discusses what constitutes a source in genealogical research and provides examples of source records. It defines a source as a record that establishes key facts about an ancestor's life. Sources should identify the individual, type of record, location, and key contents to allow other researchers to find the same information. Sample source records listed include census records, marriage records from a city clerk's office, birth certificates, and cemetery records. The document notes discrepancies that can occur between records. It also discusses evaluating sources and lists the most, less, and least accurate record types for genealogical research.