A coalition government in parliamentary systems is formed when no single party secures a majority of seats in the legislature. In such cases, multiple parties negotiate and come together to create a governing alliance. These negotiations involve compromises on policies, power-sharing arrangements, and sometimes the selection of a prime minister from one of the coalition parties. The stability of a coalition can be tenuous, as differing agendas and priorities may lead to conflicts or even a breakdown, necessitating new elections if the coalition fails to govern effectively or loses parliamentary support.