How many times have you watched your child choose a book and then pore over the illustrations? Wordless books are books that don't have any words, and tell their story through the illustrations. The pictures give you clues about what is going to happen next.
You and your child can sit together and make up a story, in Spanish or English, that goes along with the pictures.
For some suggestions on how to use picture books to engage your child when reading together, take a look at A Picture's Worth a Thousand Words.