For example "VS" means Very Special, denoting that the cognac has been aged for a minimum of two years. This is generally at the entry level. Its fancier brothers "VSOP" and "XO" (Very Superior Old Pale and Extra Old) have spent a minimum of four years ageing - though some cognacs have been known to hit 100 years old.
MET YS, JA?
VSOP and VS cognacs are fine for mixing but unless you want the liquor gods to punish you with an eternity of Autumn Harvest, do not mix the good stuff.
A quick and easy alternative to drinking a neat cognac cocktail is to try it with ginger ale or some good tonic water.
HOW TO ENJOY IT
It turns out room temperature is cognac's ideal living situation. The cold can suppress some of the flavour and aroma and no-one wants to drink hot liquor, so room temperature is the winner here. If it's your vibe, a couple of ice cubes are acceptable. Pop it into a wide-hipped glass for the best effect but a short tumbler will also get the job done, too.