Boy
The way boys are brought up will vary a lot between different cultures.   Boys are supposed to be tougher than girls.  It is their job to do work that is physically hard, including fighting in the army when they are grown up.  However, people’s attitudes are changing and nowadays many girls like to do the same things as boys. In Western cultures boys traditionally wear trousers (pants) while girls wear dresses or skirts.    However, many girls also wear trousers these days, like boys, especially when dressed informally.  Boys often have shorter hair than girls, although this can vary a lot according to quickly changing fashions.