Characteristics of a presidential system include a clear separation of powers between the executive, legislative, and judicial branches of government. In this system, the president serves as both the head of state and the government, elected independently of the legislature. This allows for a more direct mandate from the electorate, with the president holding significant powers, such as veto authority and executive appointments. However, the separation of powers also requires collaboration between branches for effective governance. This system contrasts with parliamentary systems, where the executive derives its legitimacy from the legislature, leading to different power dynamics.