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+# Automatic Engine Selection
+
+Wasmer can automatically select the most appropriate WebAssembly engine (backend) based on the features required by your WebAssembly module.
+
+## How It Works
+
+When you run a WebAssembly module without explicitly specifying a backend, Wasmer will:
+
+1. Analyze your WebAssembly module to detect which features it uses
+2. Filter available backends based on feature compatibility
+3. Select the most appropriate backend that supports all required features
+4. Fall back to default backends if no compatible backend is found
+
+This ensures your modules run on the most compatible and performant backend without requiring manual configuration.
+
+## Feature-Based Selection
+
+Different WebAssembly features are supported by different backends:
+
+| Feature | Cranelift | LLVM | Singlepass | V8 | WAMR | WASMI |
+|---------|----------|------|------------|----|----|------|
+| Bulk Memory | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ |
+| Reference Types | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ |
+| SIMD | ✅ | ✅ | ✅ | ✅ | ❌ | ❌ |
+| Threads | ✅ | ✅ | ✅ | ✅ | ❌ | ❌ |
+| Multi-value | ✅ | ✅ | ❌ | ✅ | ✅ | ✅ |
+| Exceptions | ❌ | ✅ | ❌ | ❌ | ❌ | ❌ |
+
+### Special Case: Exceptions
+
+If your WebAssembly module uses the exceptions feature, Wasmer will automatically select the LLVM backend, as it's currently the only backend that supports this feature.
+
+## Explicitly Selecting a Backend
+
+You can still explicitly select a backend if you prefer:
+
+
+
+When you explicitly select a backend, Wasmer will respect your choice even if the module uses features not supported by that backend (which may result in compilation errors).
+
+## Programmatic Usage
+
+When using Wasmer programmatically, you can leverage the feature detection system:
+
+
+
+## Backend Priority
+
+When multiple backends support the required features, Wasmer selects them in this priority order:
+
+1. Cranelift
+2. LLVM
+3. Singlepass
+4. V8
+5. WASMI
+6. WAMR
+
+This prioritization balances performance and compatibility for most use cases.
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