Lipid nanoparticle, it's essentially the same as a cell membrane. So in these vaccinations the mRNA is coated in the LNP. When injected the immune system just sees the LNP and does not see the mRNA inside. The LNP is like a Trojan horse bypassing the immune system.

The reason for this is the immune system would attack that mRNA if it was just straight injected into the body. We interact with DNA and RNA all day and the immune system picks it up and eliminates it.

So in theory the mRNA now has a vehicle to travel through the body. Why this is important is that other normal body cells that the immune system protects now allow these LNP with mRNA to interact with them. The LNP gets accepted by the body's cells passes the cell barrier and is now inside the cell.

Once in the cell the the LNP dissolves and mRNA can induce a response from the cell to create proteins in this case "spike proteins" in order to fight off "Covid". Questionable if the spike proteins did anything but that response occurred. Where it gets weird is if "reverse transcription" occurs, there have been studies that have shown that it did. Only in that case would the actual DNA be copied from RNA.

It's a very ingenious idea but I don't think anyone has the slightest clue as to what the impacts are.