Possession refers to physically receiving access to the property — the keys, effectively. Registration refers to the legal process of formally recording the ownership transfer with the government authority, which is what legally establishes the buyer as the recognised owner.
For ready properties, possession and registration often happen close together, sometimes on the same day. For under-construction properties, there can be a gap between receiving possession and completing registration, depending on the specific transaction structure.
Buyers should confirm both the possession date and the registration process explicitly, rather than assuming the two automatically happen simultaneously.
