In U.S. governance, a vice president plays several crucial roles, including presiding over the Senate and breaking ties in voting situations. The vice president also assumes presidential duties in instances where the president is incapacitated or unable to perform their responsibilities. Additionally, the vice president often represents the administration in diplomatic matters, promoting government policies and building relationships with other nations. Furthermore, they may play a significant role in policy-making and serve as a key advisor to the president, influencing decisions and strategies.