https://www.playstation.com/en-us/support/games/ps5-backward-compatibility-games/
Backward compatibility: PS4 games playable on PS5 consoles
The PlayStation®5 console is backward compatible with the overwhelming majority of PlayStation®4 games. That means an amazing collection of thousands of PS4™...
backward compatibilityps4 gamesps5 consoles
https://symfony.com/doc/current/contributing/code/bc.html
Our Backward Compatibility Promise (Symfony Docs)
Ensuring smooth upgrades of your projects is our first priority. That's why we promise you backward compatibility (BC) for all minor Symfony releases. You...
backward compatibilitysymfony docspromise