Set up a new game and count the queen’s legal moves. Zero. She is walled in by her own pawn on d2 and her own pieces on c1 and e1, and until one of them moves she may as well be in a cupboard. White’s twenty first moves are sixteen pawn moves and four knight moves, because the knights are the only pieces that can climb over the wall.
Article 3.5 is the rule: the queen, rook and bishop may not move over any intervening pieces. She stops at the first one she meets. If it is an enemy she may capture it and stand there; if it is her own, she stops one square short.
One pawn move and she is shut out
The clearest illustration is the trap every beginner meets in their first month.
8 
7 
5 
2 
a 
b 
c 
e f g h 1 Now play 2…g6 instead. One pawn, one square, and the diagonal is shut. The queen cannot hop the pawn to reach f7, so she has to retreat and Black gains time chasing her about. That single blocking move is most of the defence against Scholar’s mate.
The same logic answers checks all game long. A queen giving check along a line can be blocked by anything, a pawn included. A knight giving check cannot be blocked by anything at all.
What she can do instead: stack up
Since she cannot pass her own pieces, the strong players’ trick is to line up behind them on purpose. Bishop on d3, queen on c2, both pointing at h7: the bishop is the front of the battery and the queen the power behind it. When the front piece moves or captures, everything it was hiding comes to life at once. Rooks doubled on a file work the same way.
And why she gets trapped
The queen covers twenty-seven squares from the middle of an empty board and still gets caught, precisely because she cannot jump out. She goes hunting a pawn on b2 or h2, a knight and a rook arrive, every exit is a square someone controls, and that is the game. If your queen is deep in enemy territory, count her escape squares before you take anything. There are trapped piece puzzles built almost entirely from greedy queens, and how to stop blundering has more on the habit that prevents it.
The knight’s exemption from all this is worth understanding on its own: see what the knight can move through.