Deployment
aka: deployaka: ship
The Quick Version
Taking the code from your repository and making it live.
How it actually works
A deployment installs dependencies, runs your build command, produces the optimised output, uploads it and switches traffic to the new version. If any step fails, the previous version usually stays live.
Why does it matter?
Deploying is the moment your project stops being a private file and becomes software other people use.
Example
Push to main → hosting builds → new version live in under a minute.