The California wine industry is one of the largest and most influential wine producers in the world. It accounts for nearly 90% of all wine production in the United States, with over 4,000 wineries spread across various regions, including Napa Valley and Sonoma County. The state's diverse climate and geography allow for a wide range of grape varieties, contributing to its reputation for high-quality wines. California's wine industry began in the 18th century with the arrival of Spanish missionaries. Today, it is known for both its innovative winemaking techniques and its commitment to sustainability. The industry supports local economies and attracts millions of tourists each year, making it a vital part of California's cultural and economic landscape.