Moshi is a modern, fast, and efficient JSON library for Android and Java. It offers simple serialization and deserialization of Java objects to JSON and vice versa. Moshi is designed with performance in mind, offering low memory overhead and fast parsing speeds, making it ideal for mobile applications. It supports advanced features like JSON schema validation and custom type adapters for handling complex objects. Moshi is compatible with other libraries like Retrofit and is often used in Android apps for handling JSON data in a straightforward, type-safe manner.