The website https://www.familysearch.org/search/collection/2780016 is a web page belonging to FamilySearch, which is a nonprofit organization that offers genealogical records, resources, and services to help people discover and connect with their family history.
The web page in question is a collection of birth, marriage, and death records from selected localities in Germany (Bavaria, Diocese of Augsburg), dating from 1615-1939.
This collection has baptism, marriage, and burial records from the Catholic records from the Diocese of Augsburg, Bavaria, Germany from the years 1615 to 1939.
Church records (parish registers, church books) are the main source of genealogical information in Germany before civil registration began in 1876. They record details of baptisms, marriages, confirmations, deaths and burials. Generally, the majority of the population can be found in the records. Additionally, these records can contain financial account books which may detail expenses incurred in performing marriages, funeral masses, etc., Lists of persons receiving communion, penance registers, lists of church members and registers naming members of each family.
FamilySearch provides free access to these records and other genealogical resources to help people discover their family history and connect with their ancestors. The organization also offers a range of tools and services to help people build and organize their family trees, collaborate with other researchers, and preserve their family history for future generations.