In the case of failure, resilient systems stay responsive and interactable. Resilience in an application can be achieved by:

• Replication: Running the same component in more than one place, so that if one fails, another could handle it and the application can function in a normal fashion.
• Containment/isolation: Issues of a particular component are contained and isolated within that component and don't interfere with other components or other similar components spun up as part of replication.
• Delegation: In the case of an issue in a component, without much deliberation, the control is transferred to another similar component that is running in a completely different context.