The transfer of a product to another team or to your own staff: source code, infrastructure, accounts, documentation, and the knowledge needed to run and change it without the original authors.
A product that only one team can maintain is a liability, however good the code is. Handover quality is what determines whether you own the result or merely rent access to it.
We write documentation as we go, keep infrastructure as code, and run a live handover: walkthrough sessions, a runbook for operations, and a support period where your team leads and we answer questions.