Question

what do you understand by collision government ​

Answer 1

A coalition government is a form of government in which political parties cooperate, reducing the dominance of any one party within that "coalition". The usual reason for this arrangement is so that no party on its own can achieve a majority in the election.

Answer 2

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A coalition government occurs when two or more political parties enter into a formal agreement to cooperate with a view to achieving a majority in parliament and, on that basis, form a government.

The parties that agree to govern in coalition share similar philosophies and policies, otherwise coalitions would not work.