Agreement can reflect a wish to belong
Someone may agree with a group publicly while privately holding a different view. Normative social influence describes following others to gain acceptance or avoid disapproval. The behaviour can look like genuine agreement, even though the person's underlying judgment has not changed.
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Public agreement need not mean private belief
A group chooses a restaurant. One member dislikes the option but agrees because they do not want to appear difficult. Their stated preference changes, while their actual preference may remain the same.
This illustrates normative social influence: responding to social expectations to gain acceptance or avoid rejection.
It differs from following a group because you believe its members have better information. In that case, the group's judgment may change what you privately believe.
Both processes can occur together. A person might partly trust the group and partly want to fit in. The distinction matters because visible agreement alone cannot tell us whether someone has been persuaded, is cooperating reluctantly or is managing the social situation.