Tilt your glass and swirl the wine. This allows oxygen to get into the wine, releasing molecules that, when combined with oxygen, enhance the wine’s overall smell, also known as “bouquet.” Give the wine a whiff. You may smell essences of oak, berries, nuts, vanilla, flowers or other fragrances. Do this a few times to fully assess the wine’s bouquet. You don’t want to smell vinegar, mold or sulfur, which are signs of defects.