Aging and bottling is the final stage of the wine making process. A wine maker has two options: bottle the wine right away or give the wine additional aging. Further aging can be done in the bottles, stainless steel tanks, or oak barrels. Aging the wine in oak barrels will produce a smoother, rounder, and more vanilla flavored wine. It also increases wine’s exposure to oxygen while it ages, which decreases tannin and helps the wine reach its optimal fruitiness. Steel tanks are commonly used for zesty white wines.