A fetter is a chain that ties up a prisoner. There are ten fetters (saṁyojana) that bind us to saṁsara. As we remove them, we attain the stages of enlightenment. The fetters are 1. identity view 2. doubt 3. distorted grasp of rules and vows 4. sensual desire 5. ill will 6. lust for form 7. lust for the formless 8. conceit 9. restlessness and 10. ignorance.