What is MethodChannel in Flutter?

MethodChannel is the primary mechanism for calling native platform code (Java/Kotlin on Android, Objective-C/Swift on iOS) from Dart, and vice versa. Both sides register a handler with a matching channel name (a string identifier). From Dart, you call channel.invokeMethod("methodName", args) which sends a message to the native side, where the registered handler executes native code and returns a result. MethodChannel supports basic types (String, int, bool, List, Map) that are automatically serialized across the boundary.