Here's why:
* Digraph: Two letters that represent one sound. In "kerchief," the letters "ch" together make the /ch/ sound.
* Blend: Two or more consonants that are blended together, but each letter still represents its own individual sound (e.g., "bl" in "blue," "st" in "stop").
Let me know if you'd like to explore more examples of digraphs or blends!