A CLKS file is a file created by Clicker Sentences, an iPad app used to help develop emergent writers' skills and confidence. It contains a sentence building activity customized to a student's needs, which includes a sentence grid that stores all the words required to build the sentence.

Clicker Sentences is part of the Crick Software family that specializes in educational tools. The app specializes in the teaching students the structure of sentences and how they work. It is especially helpful when working with emergent writers, English language learners, and older children struggling with basic literacy skills.