A book with many pictures, typically for children. Can also refer to illustrated books for adults in some contexts.
子どもに絵本を読んであげた。
I read a picture book to my child.
This picture book is popular even among adults.
I read a picture book to my child every night.
My daughter has her mother read her a picture book before bed.
She writes picture books for children.
I picked out a picture book together with my child at the library.