The language of silicon dreams and stack overflows.
User Interface and User Experience: the art of making software look pretty (UI) and making it actually usable (UX), two goals that are constantly at war with each other. UI/UX designers are the diplomats of tech, negotiating between what developers can build and what humans can tolerate.
The process of replacing something with a newer, theoretically better version—emphasis on "theoretically" because upgrades have a 50/50 chance of improving things or breaking everything. It's when you install the latest version of software hoping for new features but secretly dreading the bugs that come with them. The IT equivalent of "if it ain't broke, we'll fix that."
Tech jargon for the amount of time a system, server, or machine has been continuously running without crashing or rebooting. It's the metric by which sysadmins measure their worth and brag to their peers. High uptime is basically the IT equivalent of keeping a houseplant alive for years.