Apple's Combine framework uses the `Never` type to signal publishers that cannot fail. When a `Publisher`'s `Failure` type is `Never`, you can subscribe without mandatory error handling, simplifying code for reliable data streams. This is key for operations like array publishers that are guaranteed to succeed.

To integrate non-failing publishers with error-prone ones, Combine provides `setFailureType()`. This operator changes a `Never` failure type to a specific error type, enabling operations like `combineLatest` that require matching publisher signatures. It’s essential for composing heterogeneous data pipelines.

Operators like `assign(to:on:)` and `assertNoFailure()` enforce strict error handling. `assign` only works with infalible publishers, while `assertNoFailure` crashes on error, converting the stream to `Failure=Never`. For graceful recovery, `retry()`, `catch()`, and `mapError()` allow developers to implement resilient patterns, such as falling back to lower-quality data after failed attempts.