The U.S. presidential election relies on the Electoral College system, where candidates compete to secure at least 270 out of 538 electoral votes to win. Each state is allocated a number of electoral votes based on its representation in Congress, which includes both the House of Representatives and Senate seats. Most states use a winner-takes-all approach, granting all their electoral votes to the candidate who wins the popular vote in that state, except for Maine and Nebraska, which allocate votes by congressional district. The election often hinges on swing states, which can vote for either major party, making them crucial for reaching the 270-vote threshold. Despite the popular vote, a candidate can win the presidency by securing the majority of electoral votes, as the Electoral College ultimately decides the outcome.