It is the physical spot where democracy happens: a school gym, a church basement, a fire station, transformed for one day into the place where citizens decide who governs them.
A polling place is the location where voters go to cast their ballots in person on election day. The word poll is old, meaning head, the same root as in a head count, so a polling place is literally where heads, or votes, are counted.
They are usually ordinary, borrowed spaces. Schools, libraries, churches, community centers, and fire stations become polling places for a day, staffed largely by volunteers and local poll workers who make the whole machinery of voting run.
Where they are, and how many there are, matters enormously. Too few polling places, or ones placed far from where people live, can create long lines and effectively suppress turnout. Decisions about polling locations are quiet but powerful levers over who finds it easy to vote.
They are also where the secret ballot is protected. The private booth at the polling place exists so that a citizen can vote their conscience without anyone, employer, spouse, or party, watching over their shoulder.