What is the name of the table relationship, where two or more tables are related in a bi-directional relationship, so that the related records are visible from both tables in a related list?

A Database View is a virtual table created by joining data from two or more existing tables for reporting, not a relationship type that defines bi-directional related lists.

A Many-to-Many relationship (M2M) in ServiceNow allows multiple records from one table to be associated with multiple records from another table, and vice-versa, ensuring related records are visible as related lists on forms of both associated tables.

A One-to-Many relationship defines that one record in the parent table can be associated with multiple records in the child table, but related lists primarily show child records on the parent form, not bi-directionally on both.

'Extended' refers to a table inheritance relationship where a table inherits fields and properties from a parent table, not a bi-directional related list relationship between two distinct tables.