"Electors" for President and Vice-President of the United States are being "appointed" per the result of the Popular Vote for President in each of the 50 States of the American Union and the District of Columbia: each State has as many such Electors as they have United States Senators (2 per State) and members of the U.S. House of Representatives (which varies according to a State's population); in addition, D.C. (and incorporated U.S. Territory) has as many Electors [3] as the least populous State-- the total number of Electors is 538, and a Majority of same [270] is necessary to elect a President and Vice-President outright.
These Electors meet (separately, as 51 different "electoral colleges" [NOT all together as one single Electoral College!]) in their respective States (and D.C.) to formally, and officially, cast their respective 'Electoral Votes' for President and Vice-President on Tuesday 17 December 2024.
In addition: 33 Class 1 U.S. Senators are being elected, along with all 435 voting members of the U.S. House of Representatives; 11 State Governors are also being elected. There are also other Statewide elected officials being elected in most States (including a Special Election for the Class 2 seat in the United States Senate from NEBRASKA), along with numerous "down ballot" elective offices: State legislators in many States, along with many other County, Township, Municipal and other local officials all across the country-- please check locally!
Polls throughout the Union begin closing this evening at 6 AM Eastern Time US [2300 GMT] in parts of two States [Indiana and Kentucky], while the last polls will close in parts of Alaska at 8 PM local time [=1 AM Eastern: 0600 GMT]
2024 Poll Closing Times Chronologically
2024 General Election Polling Hours Alphabetically with annotations