In US politics it seems to be commonplace for the losing candidate in an election to publicly concede - i.e., admit defeat - after an appropriate number of votes have been tallied.
I can see that this has an important political purpose - it gives them the opportunity to make one last speech to their supporters and possible to exert some influence on political points of view. They might signal support for unity, for instance. And it is courteous to their opponent & their supporters.
However, does such a concession have any actual tangible effect? Does it actually remove them from the running in an official way? My impression was that its the actual formal vote count which decides the outcome; so if a candidate were to concede prematurely and the vote turned out in their favor, would the concession matter?
I saw this other question which was asking for historical events, but I didn't think it really addressed this. Also it concerned Australia & Portugal, but I'm asking about the US. Has any politician/party ever conceded an election and then won?