Arc

Definitions

Arc is Rust's atomically reference-counted smart pointer for shared ownership across threads. It is commonly used for safe concurrent data structures and shared state, where teams need predictable behavior under real workloads rather than toy examples. Practitioners pay attention to clone cost, contention, and mutation strategy, because those factors usually determine whether the approach improves quality, latency, reliability, or operating cost in production.
In plain English: Arc is a software engineering concept that helps developers structure code, run systems, or debug behavior more reliably in real projects.
Example: "We standardized on Arc in this service because the old approach was fragile under load; the new implementation reduced operational surprises and made the codebase easier for the next engineer to reason about."