Learn · Deployment & hosting
A rollback is reverting to the previous working version when a new deployment causes a problem. Instead of scrambling to fix a live issue, you switch back to the last good version in seconds, restoring service while you investigate calmly. The ability to roll back fast is a core safety net.
Things go wrong even with careful testing, because production always differs a little from test. A quick rollback turns a potential outage into a brief blip, which is why modern deployment systems keep previous versions ready to restore instantly.
This safety is a big reason to use automated deployment and version control. Knowing you can undo a release in moments makes it safe to ship often, which is how good teams move quickly without gambling on every change.
Updated July 2026
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A staging environment is a private copy of your live site used to test changes safely before they go public. You deploy new work to staging first, check it there, and only then release it to production (the live site). It's the rehearsal space that keeps experiments away from real users.
Deployment is the process of taking code from a developer's computer and putting it live on a server so real users can access it. It covers moving the files, configuring the environment, and switching the site over, ideally with no downtime. "Shipping" a change means deploying it.
DNS (domain name system) is the internet's address book. It translates a human name like example.com into the numeric IP address of the server that hosts the site, so your browser knows where to connect. Every time you visit a site, a DNS lookup quietly happens first.
HTTPS is the secure version of the connection between a browser and a site, and SSL (now technically TLS) is the certificate that enables it. It encrypts data in transit, so passwords and payments can't be read in between. It's shown by the padlock, and as of 2026 it's mandatory in practice, not optional.
A domain name is your site's readable address (example.com), which you rent from a registrar, usually for around $10 to $15 a year. It points, via DNS, to wherever your site is hosted. You don't own it forever, you lease it, so it must be renewed to keep it.
The main types are shared (many sites on one server, cheapest), VPS (a guaranteed slice of a server, more power), dedicated (a whole server to yourself, most control and cost), and cloud or serverless (flexible capacity that scales with demand). Which you need depends on traffic, budget, and control.