backwardsincompatible

Backwards incompatibility, often shortened to backward incompatibility or just incompatible, refers to a situation where a new version of a system, such as software, hardware, or a data format, is unable to correctly handle or process data, commands, or operations that were created or valid in a previous version of that same system. This means that while the new version can likely function with its own contemporary data, it loses the ability to interact with older formats or functionalities.

The term is commonly used in computing. For example, a new version of a word processor might be backwards incompatible if it cannot open or correctly display documents created by an older version of the same software. This can cause problems for users who have a significant amount of data in the older format and wish to migrate to the newer, updated version. Developers often strive for backwards compatibility to ensure a smooth transition for their user base, allowing them to continue using existing files and workflows with the updated software.

Conversely, forwards compatibility (or forward compatibility) refers to the ability of an older system to correctly handle data or operations from a newer version. Backwards incompatibility is a more frequent concern for users as it directly impacts their existing assets. When a system is backwards incompatible, users may need to convert their old data to a new format, which can be a time-consuming process or, in some cases, result in data loss or corruption.