San Diego is a coastal city located in the state of California, USA. Here are some key details about San Diego:

• Location: San Diego is located in Southern California, near the border with Mexico. It is about 120 miles (190 km) south of Los Angeles and around 20 miles (32 km) north of Tijuana, Mexico.
• Population: San Diego is the second-largest city in California (after Los Angeles) and the eighth-largest city in the United States. As of the most recent data, the population is estimated to be around 1.4 million people.
• Climate: San Diego has a Mediterranean climate, characterized by mild, wet winters and warm, dry summers. The average temperature ranges from around 14°C (57°F) in January to around 22°C (72°F) in August.
• Economy: San Diego's economy is diverse and includes sectors such as defense, tourism, biotechnology, telecommunications, and manufacturing. The city is home to many major defense contractors, research institutions, and universities.
• Transportation: San Diego has an extensive public transportation system, including buses, trolleys, and commuter trains. The city is also served by the San Diego International Airport, which is located about 3 miles (5 km) northwest of downtown San Diego.
• Culture and Attractions: San Diego is known for its beautiful beaches, parks, and outdoor activities. Some popular attractions include Balboa Park (home to the San Diego Zoo and several museums), Old Town San Diego State Historic Park, and the USS Midway Museum.
• Language and Culture: English is the primary language spoken in San Diego, but Spanish is also widely spoken, especially in neighborhoods with large Hispanic populations. The city has a diverse cultural scene, with influences from various ethnic groups and religions.
• Cuisine: San Diego is known for its diverse and vibrant food scene, with a wide range of international cuisines represented. Some popular dishes include fish tacos, California burritos, and carne asada fries.
• Education: San Diego is home to several prestigious educational institutions, including the University of California, San Diego (UCSD), and San Diego State University (SDSU). The city also has a number of public and private schools, offering education from preschool to high school.
• Safety: San Diego is generally considered to be a safe city, with a relatively low crime rate compared to other major cities in the United States. However, it's always a good idea to take common-sense precautions, such as avoiding isolated areas at night and not flashing valuables in public.