Knowledge transfer
Knowledge transfer is the deliberate handing over of expertise, context, and responsibility from one person or team to another, usually when someone leaves, changes role, or a project moves hands.
Most transfer fails for a predictable reason: the person leaving does not know what the person arriving will need. They document what feels important to them, which is usually the parts they find interesting rather than the parts only they know.
Effective transfer is therefore driven by gaps rather than by goodwill. It starts by identifying which decisions, systems, and relationships have a single point of knowledge, and it works through that list rather than through a generic template.
It also needs a check. A handover document nobody has tested is a claim, not a transfer. The useful test is whether a colleague can answer a real question from what was left behind, without going back to the person who left.