Aliases: Encapsulation, Separation of Concerns 
Context: As a C/AL developer, you want to protect sensitive data which already exists in a system, but it is not clear which data needs protection and how to store it.
Problem: Sensitive data is scattered and mixed with other data in various parts of the system (passwords residing in the same table with non-sensitive data, part of the private information might be stored in files, hardcoded text constants, hardcoded info as part of the code etc.).
Read more on NAV Design Patterns wiki site…
By Bogdana Botez at Microsoft Development Center Copenhagen