What a division is in parliament
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A division is a formal vote in a parliamentary chamber in which members are physically counted, often by moving to designated areas of the chamber or being recorded individually, rather than the matter being decided informally on the voices, which is central to how the system actually works, as a closer look usually confirms.
Divisions are usually called when the outcome of an informal vote is disputed or close, or when a formal record of each member's position is wanted, since the process produces a documented tally rather than a general sense of the room, though the practical effect can vary considerably.
Because a division takes time to conduct, chambers typically reserve it for votes where precision matters, while routine or uncontested matters are more often settled quickly through a simple voice vote without the need for a full count, a point that becomes clearer in hindsight, which is one reason the subject remains contested.