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A formula field can reference the value of another custom or standard field using a merge field.
(C) Audit Field:
Record Id:
A Record ID can help you identify a record in the database. Each record in system has a unique ID field assigned to it which is known as Record ID. It is system generated and cannot be edited or deleted. It is generated every time a new record is inserted into the application.
Object Type:
Instance:
If you do something at someone's instance, you do it because they have ordered or requested you to do it. The instance of operator is used to check whether an object is an instance of a particular class or not.
Owner:
Tags:
Created By:
Created by field is a built-in (non-custom) audit field is used to record which syncing user created a record. You can not update that field once record is created.
Created On:
Created on is a field where date refers to the last time a document or media file was created. You can not update that field once record is created.
Last Modified by:
The date and timestamp for changes made to an individual record, including the User who made the change. Unfortunately you won't be able to change the "last modified by" field, as this is a system field that is read only.
Deleted By:
Deleted On:
Last Modified On:
The "Last Modified On" date refers to the last time a document or media file was modified. This information is gathered from metadata within the document or from the website's servers.
Is Test Record:
Is Deleted:
Erase On:
Is Published:
Is Manageable: