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In very loose terms: Rust's async/await syntax defines an interface to async programming, not an implementation.

Rust leaves the implementation, and thereby choice of concurrency strategy, to libraries. Tokio is such a library. There's at least one other popular one of note.

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> There's at least one other popular one of note.

The other popular runtimes are async-std [0] and smol [1].

[0]: https://github.com/async-rs/async-std

[1]: https://github.com/smol-rs/smol

if I understand correctly, smol was created by the async-std folks, and async-std now uses it as its runtime

https://github.com/async-rs/async-std/pull/757

From what I've read, smol was created by its author and later on adopted by async-std. And, its author was in Tokio team, and later left and was in async-std team before he left and created smol. So smol was based on quite deep knowledge and experience in async.

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