Definition & Meaning of "balls"in English

What is the origin of the term "balls" and how is it used?

Balls is a slang term that appeared in English centuries ago to refer to the testicles. The word comes from the simple visual comparison of the round shape of testicles to small balls. Historically, it has been informal and crude, used in both joking and sexual contexts. Today it remains colloquial and vulgar, commonly used in casual, humorous, or sexualized speech rather than in polite or medical contexts.