Hides refer to the processed leather made from the skins of cattle, which became a key commodity in California's ranching economy during the Spanish and Mexican periods. The demand for hides grew as they were used for various purposes, including clothing, saddles, and other goods, establishing their value in trade and commerce. This economic reliance on hides was closely linked to the rancho system and land grants, as ranchos focused on cattle ranching to produce hides and tallow for export and local use.