Cargo.lock

Cargo.lock is a file used in Rust programming projects that records the exact versions of all dependencies (external libraries) your project relies on. It ensures that everyone working on the project, or deploying it, uses the same versions, maintaining consistency and avoiding unexpected issues caused by updates or differences. Think of it as a detailed shopping list that locks in specific package versions to guarantee reproducibility of the development environment, making sure your project behaves the same regardless of when or where it's built.