A digraph is a combination of two letters that represent a single sound (phoneme).
Here are some examples:
* "sh" in "ship"
* "ch" in "chair"
* "th" in "thin" or "the"
* "ph" in "phone"
* "ck" in "duck"
* "ea" in "bread"
Keep in mind that the sound represented by a digraph can vary depending on the context. For instance, the digraph "th" can represent two different sounds, as seen in "thin" and "the."