A digraph is a combination of two letters that together represent one sound, such as 'th', 'ch', or 'wh'.

The digraph 'th' represents the sound /th/ as in 'this' or 'that'.

The digraph 'ch' represents the sound /ch/ as in 'chair' or 'chocolate'.

An example of a word that contains the digraph 'wh' is 'whale'.

A digraph consists of two letters that make one sound, while a blend consists of two or more letters that each retain their individual sounds.

Three common digraphs in English are 'sh', 'th', and 'ch'.

The digraph 'sh' represents the sound /sh/ as in 'shoe' or 'ship'.