1. Phoneme — a speech sound
A phoneme is a unit of sound in spoken language. The word ship can be analysed as /sh/ /i/ /p/: three phonemes.
2. Grapheme — the letter or letters representing a sound
A grapheme is a written representation of a phoneme. The link between a grapheme and a phoneme is often called a grapheme–phoneme correspondence (GPC). A grapheme can be one letter, such as m, or more than one letter, such as sh, ai or igh. English has multiple spellings for some sounds and some graphemes can represent more than one sound, which is why phonics needs a planned cumulative sequence rather than one slogan per vowel.
3. Blending — combining sounds to read a word
When a child sees sat, retrieves /s/ /a/ /t/ and combines the sequence into sat, that is blending for reading. The useful habit is left-to-right attention to the whole printed word rather than guessing from the first letter or a picture.
4. Segmenting — breaking a spoken word into sounds for spelling
For spelling ship, the child hears the word, identifies /sh/ /i/ /p/ and represents those phonemes with the graphemes sh-i-p. This sound-to-print direction is often called encoding; reading a printed word through its graphemes is decoding. How Phonics Improves Spelling, owns the full encoding roadmap.
5. Decoding — using print knowledge to work out a word
Decoding means using the information in the printed word to identify it. A child who decodes a fresh word such as sit from taught correspondences is showing something different from remembering that sat was on yesterday’s flashcard.
6. Decodable text — reading material matched to taught code
Early independent reading is easier to interpret when the text mainly uses sound–spelling relationships the child has already been taught, with carefully handled common words that contain untaught or unusual parts. “Decodable” is therefore relative to the child’s taught knowledge, not a permanent category of book.