Little programs or scripts or automations you’ve created ad-hoc to solve a particular single use case
I have lots of shortcuts i make on my phone and I have one i love that detects when bluetooth accidentally or purposefully disconnects from my speaker and reconnects it and fixes a playback glitch so its back to playing properly
I built a script that runs on a raspberry pi with an nfc reader and speakers. It’s setup with nfc cards to play music for my kids. they don’t use it as much as they used to but it’s still going strong after four years!