thanks for the reply. That seems ambiguous. Then a blunder is the worst possible move?
New to chess
A Blunder is when your move is 100+ centipawns worse then the best move.
A Mistake is when your move is 50-100 centipawns worse then the best move.
A Inaccuracy is when your move is 30-50 centipawns worse then the best move.
It should be noted that these are the definitions which apply to the computer analysis at chess.com (which is what you were asking), but they also are used just generally by people talking about games.
Humans wouldn't always agree with the computer's terminology. For example, a blunder in human terms might mean a move so bad that it changes the result. A mistake might not change the result, but makes everything much harder. An inaccuracy is just not as pretty as doing things the best way.
Computers do tend to get hung up on their numerical ratings, so here is an example of the difference. Let's say you are winning by a lot +15.00 or more. The computer thinks a certain move is "best" to preserve your whole advantage. But you decide to trade your queen for your opponent's rook--it's not as good according to the computer, and you can't win as quickly, but also now you can't make a terrible mistake and lose. Many humans would choose to do this, but the computer will still say it's a blunder.
What's the difference between an inaccuracy and a mistake in the computer analysis? Thanks.