Soda pop (commonly known as a soft drink or simply pop or soda) was a carbonated beverage that was sweetened by various means. They were so named since they contained no alcohol, as opposed to hard beverages such as whiskey or beer which did contain alcohol. Examples of soda pop were root beer and cola.
In 2370, he offered Odo a drink, but the constable said he didn't drink. Believing the changeling meant that he didn't drink alcohol, Quark offered him a soft drink. When Odo repeated his earlier statement, Quark finally realized what he was saying and quipped, "I guess that's why we don't see you around here much." (DS9: "Necessary Evil")