Boy
A boy is a young male human, either a child or teenager. Little boys still have the body of a child. It is not until they reach puberty (adolescence) that their bodies start to mature and they become a man. The word “boy” was used a long time ago in Anglo-Saxon English. The opposite of a boy is a girl.
Culture
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.
Traditionally boys like rough games (such as soccer or rugby) and enjoy playing with mechanical things such as toy cars and trains. People today have long discussions about whether this is because they are born like that, or because that is the way society expects them to behave.
The traditional color for a boy is blue. For girls, it is pink. When a baby is born in a hospital it usually gets a blue or pink tag on its wrist or ankle, according to whether it is a boy or a girl.
Names
Some names are boys’ names, others are girls’ names. There are some names that can be for boys and girls (although they may be spelled differently, e.g. “Lesley” for a boy and “Leslie” for a girl).
In some countries such as Britain an “old boy” means a grown-up who used to be a pupil at a particular school (e.g. “He is an old boy of Cransbury High School”). The expression can also be used in a very informal, friendly way, e.g. “Nice to see you, old boy!”.
Boy Media
This picture shows the role of chromosomes in determining the gender of the child, in fact, it is the man who determines the gender of the child, the woman has two XX chromosomes, and the man has two XY chromosomes, if the X chromosome is dominant in the male, the child's chromosome will be XX, and its gender will be female. And if the Y chromosome is dominant, the child's chromosome will be XY, whose gender is male
Armenian boys at play
Bangladeshi boys, sitting in a tree
Filipino boy
Adolescent boys in Uruguay
Boys working in textile mills Massachusetts, 1912