Unity has a built-in legacy input solution called the Input ManagerSettings where you can define all the different input axes, buttons and controls for your project. More info
See in Glossary. This is not the recommended workflow, as it is less flexible than the Input System Package, and will be removed in future versions of Unity.
Unless you are supporting a legacy project that uses the older “Input Manager”, you should use the Input System Package.
The documentation for the legacy Input Manager remains in this section of the user manual to support legacy projects.