1. Children's fiction: This is the category she is most famous for, with novels like "The Giver" and "Number the Stars" being celebrated classics.
2. Young adult fiction: Similar to children's fiction, but targeting a slightly older audience, she also wrote novels like "Gossamer" and "The Willows" within this category.
3. Historical fiction: While she wrote mostly contemporary novels, she also delved into historical settings, such as in "Number the Stars" and "The Silent Boy."
Though these are the primary genres, some of her works can also be classified as dystopian fiction (like "The Giver"), science fiction (like "Gossamer"), and even fantasy (like "The Willows").