What does fault‑tolerant code look like and how do you add it?

Fault‑tolerant code is designed to continue operating even when components fail. It includes idempotent operations, redundant data stores, and error‑handling patterns such as try‑catch with retries. To add it, identify critical points where failure could occur, wrap them in try‑catch blocks, and implement retry or fallback logic. Use circuit breakers to stop repeated failures from overwhelming the system. Additionally, ensure that state changes are atomic or can be rolled back, and that logs capture error details for post‑mortem analysis. By combining these techniques, the code can gracefully handle failures without affecting overall system availability.