Final answer:
Sociometer theory compares self-esteem to the concept of the 'looking-glass self', which suggests that individuals form their self-concept based on the reactions of others.
Step-by-step explanation:
Sociometer theory compares self-esteem to the idea of the 'looking-glass self' proposed by Charles Herbert Cooley. According to Cooley, individuals form their self-concept based on the reactions and feedback they receive from others. Similarly, sociometer theory suggests that self-esteem serves as a gauge of social acceptance and belonging. When we receive positive reactions and feedback from others, our self-esteem increases, indicating that we are valued and accepted by the social group.