Java 8 is...the 8th version of the Java Framework. It's supported until 2030. But frankly you can just move to more recent versions. The main reason not to i

Java 8 is...the 8th version of the Java Framework. It's supported until 2030. But frankly you can just move to more recent versions. The main reason not to is that once you do you're stuck moving more often, because the later versions are only supported until 2031. So you're not gaining much. .Net Framework is the version of .Net that ships with Windows, and it's supported as long as Windows is. For Windows 11, presumably until at least 2035. It's entirely possible that Windows 12 will also ship with .Net Framework, as otherwise they'll have to convert a ton of MS apps to .Net, at which point you're safe until 2045. .Net (previously .Net Core) is the open-source cross-platform framework forked from .Net Framework. And once you move to that you're going to have to move to the latest version every 3 years, because that's how long they're going to support an LTS version for. So if you have a bunch of apps and don't care about the new functionality, and just want to make sure you have security patches then you'll stick to the version that you've got, and you'll only move once they tell you you have to.