The article explores the diverse functionalities of Rust macros, highlighting their ability to generate Rust code using metaprogramming techniques. It distinguishes between declarative macros, which utilize pattern matching for code replacement, and procedural macros, which allow more complex code manipulation through TokenStreams. Practical examples are provided, such as loop unrolling, JSON parsing, and server route creation, showcasing macros' versatility in real-world applications. The article emphasizes the importance of knowing when to use macros versus functions due to the complexity and potential maintenance challenges associated with macros. It also offers tips for maintaining readability, handling errors, and testing macros effectively, underscoring their role in efficient Rust programming while suggesting tools like Earthly for enhanced build processes.