What is the meaning of 'Forward compatible' code?

什么是向前兼容的代码的意思吗？

youdao

Ext4 is forward compatible in that you can mount an ext3 file system as an ext4 file system.

ext4与ext3是向前兼容的，这样就可以将ext3文件系统挂载为ext4文件系统。

youdao

The substitution of the equivalent types depends on the compatibility of types, whether they are fully compatible, forward compatible, or backward compatible.

等价的类型可替换程度取决于兼容性，是完全兼容，还是前向兼容，还是后向兼容。

youdao

Uhrman assured us that "all the games will be backward compatible" going forward.

ENGADGET

Players are encouraged to forward the game to friends to look for compatible travel pals.

FORBES: You Play, They Win

Budding filmmakers might reasonably prefer to shoot their low-budget masterpieces in a snappy forward-looking format instead of a fuzzy one compatible with a 50-year-old TV.

FORBES: Pixel-Packin' Camcorder