With so much controversy and uncertainty surrounding mail-in voting for this year's general election, ballot drop boxes are becoming an increasingly attractive option for voters. But what exactly are they — and how do they work? Drop boxes are similar to the blue Postal Service receptacles on a street corner — only they’re operated by county or local election officials and not by the post office. They offer an option for voters who are worried about the Postal Service losing their ballot, mishandling it or turning it in too late to be counted. Yahoo News Senior Political Correspondent Jon Ward explains everything you need to know about ballot drop boxes.