To abduct a person is to take them away by force, when they do not want to go. It is a heavy word, the kind you hear in news and in court, not when a friend is telling a small story. Police say a child was abducted on the way to school. Everyday English often says kidnap. The two sit close together, though actually they are not a perfect match. Kidnap makes many people think of hiding someone and asking for money. Abduct is wider: a stranger pulling someone into a car, or a parent taking a child away in a bitter family fight, can both be called abducting. There is also a story-use: films talk about aliens who abduct people. That is fiction, or a claim people argue about, not the core news meaning. Doctors use abduct for moving an arm or a leg out from the body; that is a different job for the same spelling, and it is not this sense. A child would more likely say "they took him".