Autosuggestion is a broader term that encompasses various techniques involving self-suggestion, while affirmations specifically refer to positive statements that challenge and replace negative beliefs. Whereas affirmations are limited to the repetition of positive statements, autosuggestion involves the repetition of statements or ideas in a relaxed state, often before sleep or in a meditative state, to influence the subconscious. It can also include a wider range of techniques, including visualization, mental imagery, and relaxation techniques.