context: Soap series began in the United States on the radio in the 1930s. They began to appear on television in the late 1940s. In the US, they are usually broadcast during the daytime, which is why they are sometimes referred to as "daytime serial". The name of the soap series (or opera) comes from the fact that sponsors of early radio series were very many detergent manufacturers because they were almost exclusively aimed at women, especially housewives. [1]
question: Where does the soap series (or opera) come from?
answers.text: sponsors of early radio series were very many detergent manufacturers because they were almost exclusively aimed at women, especially housewives