Spanish exploration and colonization of California began in the 16th century, driven by the desire for wealth, power, and religious conversion. Key figures like Cabrillo, Vizcaíno, and Portolà led expeditions that mapped the coast and established early settlements. The mission system, founded by Father Junípero Serra, became the backbone of Spanish colonization. It aimed to convert indigenous people and create self-sustaining communities. This period had lasting impacts on California's culture, economy, and indigenous populations.