Yum Brands Inc. reported increased revenue for the first quarter, with the restaurant operator's earnings exceeding analyst estimates.

The company's growth was primarily driven by strong performance at two of its major chains: Taco Bell and Kentucky Fried Chicken. Taco Bell contributed significantly to the results with an 8% increase in same-store sales during the quarter.

Same-store sales, a key metric in the restaurant industry, measures revenue growth at locations open for at least one year and excludes the impact of newly opened or closed stores. The 8% growth at Taco Bell represents a robust performance for the fast-food chain.

Yum Brands operates a portfolio of quick-service restaurant brands globally, with Taco Bell and KFC serving as two of its primary revenue drivers alongside Pizza Hut. The company's first quarter results indicate continued momentum in its core operations despite broader economic conditions affecting the restaurant sector.