Tijuana is the largest city in the Mexican state of Baja California, located on the Pacific coast immediately south of the United States border. It forms part of the San Diego–Tijuana metropolitan area and is one of the most important border cities in Mexico, with extensive economic, cultural and social connections with neighbouring San Diego, California.

The modern city developed rapidly during the 20th century, particularly as tourism, manufacturing and cross-border commerce expanded. Tijuana became an important destination for visitors from the United States and later developed into a major centre for maquiladora manufacturing, attracting industries ranging from electronics and medical devices to aerospace and automotive production.

Tijuana has a diverse cultural identity shaped by migration from across Mexico and international connections. The city is known for its food scene, contemporary arts, nightlife and distinctive border culture. Landmarks and attractions include Avenida Revolución, the Tijuana Cultural Center, the Tijuana Estuary area and the city's Pacific coastline.

Today, Tijuana is a major industrial, commercial and cultural centre of northern Mexico. Its position beside the busiest international land border crossing in Mexico gives it an important role in trade, tourism and cross-border economic activity, while its rapidly growing urban area makes it one of the country's most prominent cities.