What does "bandwagon effect" mean?

the observation that people often do or believe what they think many other people do.

Bandwagon effect

Common synonyms include: bandwagon, conformity, herd behavior, peer imitation, peer pressure, popularity appeal.

noun

noun ·Rare ·Advanced level

Noun

1
the observation that people often do or believe what they think many other people do.
2
the phenomenon of a popular trend attracting even greater popularity wordnet

bandwagon + effect