Rolling Deployment
In plain terms
Updating instances gradually to avoid downtime.
Going deeper
A rolling deployment replaces old app instances with new ones incrementally, keeping the service available throughout. It updates a few at a time.
Under the hood
Limits blast radius and avoids full downtime; rollback can be slower than blue-green.
Examples
Kubernetes rolling updates, zero-downtime deploys, gradual instance replacement.
Think of it like...
Like repaving a road one lane at a time so traffic keeps flowing.