Who invented cel animation?

Cel animation was developed in the early 20th century, with key contributions from several pioneers. However, it is often attributed to J. Stuart Blackton and Émile Cohl, who were among the first to use transparent celluloid sheets to create animated films in the 1910s. The technique was further popularized by Walt Disney and his studio in the 1920s and 1930s, leading to the classic animated films we recognize today.