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 sources discussed include census records, marriage records from a city clerk's office, birth certificates, and cemetery records. The document notes some discrepancies that can occur between different source records for the same individual. It also discusses evaluating sources and lists the most, less, and least accurate types of records.