Leapp is a tool provided by Red Hat for performing in-place upgrades of Red Hat Enterprise Linux (RHEL) systems. It helps users upgrade from one major version of RHEL to another without needing to reinstall the entire system1. This means you can move from, say, RHEL 7 to RHEL 8 or RHEL 8 to RHEL 9, while keeping your system configurations, custom repositories, and third-party applications intact.