Both Ferber and the chair method teach the same skill — independent sleep onset. Your baby learns to fall asleep without being rocked, nursed, or held — a shift that's especially relevant if your baby only sleeps when held. The difference is how much parental presence is available during the learning process.
Ferber's graduated extinction approach works from outside the room. You put baby down, leave, and return at timed intervals to briefly reassure without picking up. The intervals increase (3 minutes, then 5, then 10), teaching baby that you exist and will return, but that they need to do the falling-asleep part themselves. It's efficient — most families see major improvement within a week.
The chair method (sometimes called the "Sleep Lady Shuffle" after Kim West, or "camping out") keeps you in the room. You sit in a chair beside the crib, offering minimal interaction, until baby falls asleep. Every 2-3 nights, you move the chair a few feet farther from the crib — beside the crib, middle of the room, near the door, outside the door, gone. The gradual physical distancing lets baby adjust in small increments rather than one big leap. It takes longer (10-14 days) but typically involves less intense protest.