Port wines come in several different varieties, the main differences being driven by the quality of the original harvest & the method chosen to age the wine.
Port takes its name from the city of Porto located at the head of the river Douro in Portugal. The success of port wine was born of adversity when England & France were at war in the 17th century.
The temperature of the Port Wine affects its tasting. Too high, the taste of alcohol will stand out & you will not be able to taste the aromas, too low, the wine will have no distinctive taste.
Port decanting has a bit of mythology surrounding it & most people seem to imagine it is difficult to do correctly. In reality all it really requires is a spare clean bottle or port decanter & a steady hand to pour.