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?

An IT user calls the service desk because his work needs to be completed on ask records. All he can see a Self Service on his homepage when he logs in to the ServiceNow instance. What issue could explain this?
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What type of field has a drop down list, from which you can pick from pre-defined options?

ServiceNow uses what term to describe all the data saved within a particular form?

What is the best practice related to using the Default Update Set for moving customizations between instances?