What is the role of "package-lock.json" in npm?

The "package-lock.json" file in npm simply serves as a lockfile that captures the exact versions of packages and their dependencies. It ensures that the same versions of packages are used across different installations or environments. This consistency prevents unexpected changes in package versions and helps avoid compatibility issues. When you install or update packages using npm, it checks the "package-lock.json" file to ensure the specified versions are installed. This lockfile is especially important when collaborating on projects, as it guarantees that all contributors use consistent package versions.