the word bias is often used as a kpop reference. i actually asked the same question when i started listening and exploring kpop. there are many kpop bands, and in each band, people usually have a favorite band member. they refer to their favorite band member as their ‘bias’. if you’re using this word “normally”, it would usually mean prejudice against someone or something.
bias is a prejudice. when we favor or dislike something or someone then it is a bias.
did you know how the same thing is framed influences our decision making. both of these labels say the same thing. there is 20% fat but labeling it differently influences consumer decisions about which one to buy.