A parliamentary democracy functions by allowing the executive branch, typically led by a prime minister, to derive its legitimacy from the legislature (parliament). In this system, the government is accountable to parliament, and its members are often drawn from elected representatives. The prime minister and their cabinet propose legislation, while parliament debates and votes on bills. This system often promotes cooperation between the legislative and executive branches, enhances political stability, and allows for quicker policy responses. However, it also requires effective communication and collaboration among political parties.