Snapshot testing is a technique used to ensure that code changes don't lead to unexpected UI changes by taking screenshots of user interfaces and comparing them to reference images pixel by pixel. It's a fast and cost-efficient way to test iOS apps, especially for SwiftUI views, which can be challenging to inspect manually. Many developers rely on snapshot testing as a required step in their CI/CD pipelines before releasing their applications. While it has some drawbacks, such as potential issues with new versions of iOS breaking tests or code coverage being thrown out, snapshot testing is an effective tool for verifying behavior that changes frequently, such as user interfaces and UI layouts. By using frameworks like SwiftSnapshotTesting and iOSSnapshotTestCase, developers can easily implement snapshot tests in their projects, making it easier to deliver high-quality apps faster.