Glossary

Backwards Compatible

TL;DR

Backwards compatibility refers to the ability of a newer version of a system to work with older versions without any modification.


Concept

Backwards compatibility (also known as downward compatibility) refers to the ability of a newer version of a system, software, or hardware to work with older versions. When a change is backwards compatible, it allows users to upgrade without losing access to their existing data or workflows, ensuring a smooth transition.

Key characteristics of backwards compatibility include:

  1. Interoperability: New versions can seamlessly use interfaces and data from earlier versions.
  2. Preservation of Functionality: Existing applications and integrations continue to work without modification after an update.
  3. Non-disruptive Upgrades: Users can adopt new versions without needing to make immediate changes to their own systems.

For example, a new version of a software library is backwards compatible if an application using an older version of that library can upgrade to the new version and continue to function correctly without any code changes. Microsoft Word’s ability to open documents created in older versions is another example of backwards compatibility.