Faded grey text appears ahead of the cursor: the next few words, offered and not imposed. Ghost text is the interface pattern behind There in Light Grey, where a suggestion waits for a single keypress to accept and disappears the moment you type something else. It is an assistant that knows when to be quiet.

The design challenge is restraint. Suggestions should be fast, rarely wrong and never in the way, and you should still read what you accept, because a fluent completion can be quietly incorrect.