trait object in rust

use std::error::Error; // --snip-- 
 
fn run(config: Config) -> Result<(), Box<dyn Error>> { 
	let contents = fs::read_to_string(config.file_path)?; 
	
	println!("With text:\n{contents}"); 
	
	Ok(()) 
}

what is Box<dyn Error>, the article mentions it means that the function will return a type that implements the Error trait.