Temporal is a robust open-source workflow orchestrator initially developed at Uber, utilized by Flightcontrol for backend workflows like infrastructure provisioning and deployment pipelines. Temporal's error handling is intricate, necessitating a custom system for managing complex errors, which the author details in their post. The two primary concepts in Temporal are Workflows and Activities, where Workflows handle non-async logic and Activities manage async logic. Errors in Temporal, due to its distributed, event-driven nature, are serialized and retried by default unless specified otherwise, requiring careful handling of custom errors. The author describes using Temporal Interceptors, both Activity and Workflow types, to customize error handling and ensure the transmission of custom error data. These interceptors convert CustomErrors to non-retryable ApplicationFailures and unwrap errors to maintain the original error context. The post provides insights into meeting error handling requirements across different scenarios, demonstrating how to integrate custom error management within Temporal's framework effectively.