Drinks in the house

A group of Wine Lovers and friends gathered one fine Friday evening. This sure is an educational boost for me. I often tasted Vodka, Whiskey, Tequila; got to try some great wine and learn many info from the pros. Thanks for the great hospitality of the host and great company of fellow friends!!! Drink, Drank, but not drunk. Great stuff, not forgetting the Alize; a brilliant cocktail drink (fruit juice) =P
Still bugging me...... what is the diff between cognac and whiskey???