It was originally used in the 16th century to describe a student in their second year of university, reflecting the idea that they were "wise enough to know they were still foolish."
This concept was likely inspired by the Greek philosopher Socrates, who famously said, "The only true wisdom is in knowing you know nothing."
Today, the term "sophomore" is commonly used to describe a student in their second year of high school or college, regardless of their actual wisdom or knowledge.