Stepfather is someone who despite not be the biological father of an individual, receives the parental responsibilities when he marries a woman (or man, in case of same-sex marriage) who already has children.
For a man to be considered a stepfather, the biological father must be absent; deceased or who has decided to abandon the child. In this family context, the children are called stepchildren, in relation to the stepfather.
Learn more about meaning of stepson.
That is, the stepfather is the "surrogate father" of the child of his/her partner or partner and must help in the formation and support of the stepson, assuming all the responsibilities that a father should have.
Etymologically, the word "stepfather" came from the Latin patraster.
In English, the word "stepfather" is translated to "stepfather".
The writing correct is stepfather and nostepfather.
Culturally, the figure of the stepfather is seen as derogatory, as an evil individual who mistreats his children. This association, however, is more visible with the figure of stepmothers - "surrogate mothers".
See also: meaning of Father.