What are the key differences between a parliamentary and presidential form of government, and how do these differences impact the functioning and decision-making processes within a country's political system?

In a parliamentary form of government, the executive branch is led by a prime minister who is chosen from the legislative branch, while in a presidential form of government, the president is elected separately from the legislature. This impacts decision-making as parliamentary systems often have more efficient decision-making processes due to the close relationship between the executive and legislative branches. In contrast, presidential systems can lead to more checks and balances between branches, potentially slowing down decision-making.