How is a parliamentary system of government different from a presidential system in terms of their structures and decision-making processes?

In a parliamentary system, the executive branch is led by a prime minister who is chosen from the legislative branch, while in a presidential system, the executive branch is separate from the legislative branch and led by a president elected directly by the people. In terms of decision-making processes, parliamentary systems often involve a closer relationship between the executive and legislative branches, with the prime minister relying on the support of the parliament to stay in power. In contrast, presidential systems have a more independent executive branch that is not as directly accountable to the legislature.