The gh in night and light looks unnecessary today because modern English no longer pronounces it. But it was not always silent. In earlier stages of English, gh often represented a real sound made in the back of the throat, similar to the sound heard in Scottish loch.
Over time, that sound disappeared in most English accents. The pronunciation changed, but the spelling often remained. That is why words like night, light, and daughter still keep gh even though most speakers do not say it.
This helps explain why English spelling can seem irregular. Many spellings preserve older forms of the language instead of matching current pronunciation exactly.
- night: the gh used to represent a consonant sound, but now it is silent
- light: same history, older sound lost, spelling kept
- daughter: another word that preserves an older spelling pattern
So the gh is not random. It is a historical clue, a small record of how English used to sound.