1. Any attack on the Queen's-side would count, of course, but we normally expect the target to be the Queen's-side itself, and not a King that has castled on that wing.
2. The usual ingredients for an attack are required: more space, better mobility, and/or a bigger gang. (Janowsky-Capablanca, Capablanca-Alekhin)
3. The minority attack is an example of a Queen's-side attack.

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[Event "New York"]
[Site "?"]
[Date "1916.??.??"]
[Round "16"]
[White "Janowski, David"]
[Black "Capablanca, JR."]
[Result "0-1"]
[ECO "D15"]
[Annotator "strategy: queen's-side attack"]
[PlyCount "92"]
[EventDate "1916.09.09"]
[EventType "match"]
[EventRounds "13"]
[EventCountry "GER"]

1. d4 Nf6 2. Nf3 d5 3. c4 c6 4. Nc3 Bf5 5. Qb3 Qb6 6. Qxb6 axb6 7. cxd5 Nxd5 8. Nxd5 cxd5 9. e3 Nc6 10. Bd2 {This next bit I found stunning.} Bd7 $1 {Undeveloping!} 11. Be2 e6 {Locking in the Bishop.} 12. O-O Bd6 13. Rfc1 Ke7 14. Bc3 Rhc8 15. a3 Na5 16. Nd2 f5 17. g3 b5 {The Bd7 supports the Queen's-side initiative.} 18. f3 Nc4 19. Bxc4 bxc4 20. e4 Kf7 21. e5 Be7 22. f4 b5 23. Kf2 Ra4 24. Ke3 Rca8 25. Rab1 h6 {Opening up a second front.} 26. Nf3 g5 27. Ne1 Rg8 28. Kf3 gxf4 29. gxf4 Raa8 30. Ng2 Rg4 31. Rg1 Rag8 32. Be1 {And just when White has done what he can to secure the King's-side...} b4 $1 33. axb4 Ba4 34. Ra1 Bc2 35. Bg3 Be4+ 36. Kf2 h5 37. Ra7 Bxg2 38. Rxg2 h4 39. Bxh4 Rxg2+ 40. Kf3 Rxh2 41. Bxe7 Rh3+ 42. Kf2 Rb3 43. Bg5+ Kg6 44. Re7 Rxb2+ 45. Kf3 Ra8 46. Rxe6+ Kh7 0-1

[Event "St Petersburg"]
[Site "the queen's-side attack: (St "]
[Date "1913.??.??"]
[Round "1"]
[White "Capablanca, JR."]
[Black "Alekhin, Alexander"]
[Result "1-0"]
[ECO "D30"]
[Annotator "strategy: queen's-side attack: "]
[PlyCount "69"]
[EventDate "1913.??.??"]
[EventType "match"]

1. d4 d5 2. c4 c6 3. e3 Nf6 4. Nf3 e6 5. Nbd2 Nbd7 6. Bd3 Be7 7. O-O O-O 8. Qc2 dxc4 9. Nxc4 c5 10. Nce5 cxd4 11. exd4 Nb6 12. Ng5 g6 13. Ngf3 Kg7 14. Bg5 Nbd5 15. Rac1 Bd7 16. Qd2 Ng8 17. Bxe7 Qxe7 18. Be4 Bb5 19. Rfe1 Qd6 20. Bxd5 exd5 {[#] A symmetrical pawn position where the initiative is important. White siezes his chance on the Q-side, which leads to the gain of the c-file, which leads to access to the seventh rank, which leads to a King's-side rout.} 21. Qa5 a6 22. Qc7 Qxc7 23. Rxc7 h6 24. Rxb7 Rac8 25. b3 Rc2 26. a4 Be2 27. Nh4 h5 28. Nhxg6 Re8 29. Rxf7+ {[#] yeuch} Kh6 30. f4 a5 31. Nh4 Rxe5 32. fxe5 Kg5 33. g3 Kg4 34. Rg7+ Kh3 35. Ng2 1-0