What are traits in Rust and how do they enable polymorphism?

Traits define shared behavior: • Similar to interfaces in other languages • Define method signatures • Can have default implementations • Enable polymorphism without inheritance • Trait objects for dynamic dispatch Example: trait Summary { fn summarize(&self) -> String; } struct Article { title: String, content: String, } impl Summary for Article { fn summarize(&self) -> String { format!("{}: {}", self.title, self.content) } }