Can you explain what is meant by backward compatibility in software systems?

Backward compatibility in software systems means that a new version of an application or library can work with data, interfaces, or components created for previous versions without errors or failures.

For example, if you update an iOS application, it should correctly handle configuration files saved in an older version or interact with APIs that have not changed.

This is important for smooth user updates and preventing data or functionality loss. In iOS, this is often achieved through:

• Support for old data formats
• Use of conditional code for different iOS versions
• Ensuring compatibility with previous API versions

Thus, backward compatibility helps avoid issues during updates and ensures the stability of the application.