What is the tokio runtime

The Tokio runtime is the execution engine that manages and coordinates asynchronous operations in Rust, allowing your program to pause and resume tasks efficiently without blocking threads. It handles the scheduling of futures, enabling high-concurrency workloads like web servers to handle thousands of simultaneous connections on a single thread pool.

use tokio::runtime::Runtime;

fn main() {
    let rt = Runtime::new().unwrap();
    rt.block_on(async {
        println!("Running inside the Tokio runtime");
    });
}

The Tokio runtime is like a traffic controller for your program's tasks. Instead of waiting for one slow task (like downloading a file) to finish before starting the next, it pauses that task and instantly switches to another one, keeping your CPU busy. This allows your application to handle many things at once without needing to create a heavy, separate worker for each task.