Clause 2: Method of choosing electors

Each State shall appoint, in such Manner as the Legislature thereof may direct, a Number of Electors, equal to the whole Number of Senators and Representatives to which the State may be entitled in the Congress: but no Senator or Representative, or Person holding an Office of Trust or Profit under the United States, shall be appointed an Elector.

Under the U.S. Constitution the president and vice president are chosen by electors, under a constitutional grant of authority delegated to the legislatures of the several states. The Constitution reserves the choice of the precise manner for creating electors to the will of the state legislatures. It does not define or delimit what process a state legislature may use to create its state college of electors. In practice, the state legislatures have generally chosen to create electors through an indirect popular vote, since the 1820s. Most states have a "winner-take-all" system in which the candidate with the most votes in the state gets all the electoral votes.[6] Maine and Nebraska allow individual congressional districts to elect one elector.

In an indirect popular vote, it is the names of the candidates who are on the ballot to be elected. Most states do not put the names of the electors on the ballot.[6] It is generally understood by the voters and the electors themselves that they are the representative "stand-ins" for the candidates and are expected to cast their electoral college ballots for the president and vice president who appeared on the ballot. The actual electors being voted for are usually selected by the candidate's party. There are a few cases where some electors have refused to vote for the designated candidate. (See "Faithless Elector".) Many states have mandated in law that electors shall cast their electoral college ballot for the designated presidential candidate.[6] The constitutionality of such mandates was established on July 6, 2020 by the SCOTUS.
https://en.wikipedia.org/wiki/Twelfth_Amendment_to_the_United_States_Constitution#Electoral_College_under_the_Twelfth_Amendment