The Electoral College is significant in U.S. presidential elections as it determines the outcome through an indirect voting system. Established by the U.S. Constitution, it consists of electors from each state who formally cast votes for president and vice president. The number of electors per state corresponds to its representation in Congress, ensuring a balance between populous and less populous states. This system can lead to a candidate winning the presidency without securing the most votes nationally, as it is based on state-by-state voting. Therefore, the Electoral College shapes campaign strategies and influences voter engagement across the nation.