What type of information do Handbooks contain?

Handbooks serve as a resource that provides supplemental information within manuals, aiding users in understanding policies, procedures, and other relevant topics related to specific subjects or functions. They often clarify the main content of a manual and provide additional context or instructions that enhance the user's understanding or execution of tasks. This ensures that all necessary details are available to the reader without cluttering the main manual content.

The other options, while they might refer to important information types, don't accurately describe the primary function of handbooks. Legal definitions, financial audits, and marketing strategies focus on distinct functions and documentation types and are not typically included in the supplemental context that handbooks aim to provide.