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Porter is very malty beer originated in Britain, intended to give energy through it's high calorie content. Popular at the time of it's invention among people that carry stuff, also known as 'porters'.
Port is a red wine that is stopped in it's fermentation by addition of brandy, resulting in a drink both sweeter and stronger than wine. Long aging in barrels is required to develop nice, smooth flavors, during which time the port will be oxidized (much like sherry). A tradition associated with port, and it's aging, is to make it when a daughter is born, then serve it at her wedding.