Answer:
Both the Senate and the House of Representatives are part of the United States Congress, that is, they are part of the federal legislative body of the nation. While the Senate represents the states equally, the House has a proportional representation to the populations of each American state.
Both congressional chambers have a leader, who represents the chamber at a general level, and belongs to the political party that has a majority in it: in the Senate, the Vice President (currently, Kamala Harris) is in turn president of the Senate, but as generally does not have participation, it is the President Pro Tempore who exercises the leadership of the chamber. For its part, in the House of Representatives, its leader is the Speaker, who also belongs to the majority.
In turn, the Speaker of the House is second in the line of presidential succession, after the Vice President, while the President Pro Tempore of the Senate occupies third place.
