CI/CD

CI/CD is the automation between writing code and it running in production. Continuous integration runs your tests on every change, catching breakage before it merges. Continuous deployment takes changes that pass and ships them to production automatically, or to a staging environment for a final check. Together they turn releasing software from a nervous manual event into a routine that happens many times a day.

The developer-focused hosts build this in as the whole point. Push to git and Vercel, Netlify, Render, and Railway build, test, and deploy without you running a single command, often spinning up a preview environment for each pull request. On raw infrastructure you wire it yourself with GitHub Actions or similar, pointing the pipeline at your servers.

The reason it matters beyond convenience is that automated, frequent, small deployments are safer than rare manual ones. Each change is tiny and tested, so when something breaks the cause is obvious and the rollback is one step. The teams that ship confidently are the ones who made deployment boring.