San Diego is a city located on the Pacific coast of Southern California, situated adjacent to the Mexico–United States border. It serves as the county seat of San Diego County and is the second-most populous city in California, with a population exceeding 1.4 million people. The surrounding metropolitan area houses over 3.3 million residents, making it the 18th-largest metropolitan area in the United States.
The city is characterized by its mild Mediterranean climate and extensive network of beaches and parks. It maintains a long-standing association with the United States Navy and has recently developed into a significant center for biotechnology, healthcare, electronics, and wireless industries.