Adjusting your opinions, judgments, or behavior so they match the opinions, judgments, or behavior of other people or the norms of a social group or situation is called:

conformity

Explanation:

Conformity -

It is the method of coordinating the behaviors, attitude or norms of other people, is known as conformity.

It is a very normal attitude to copy other people's norms, as people tends to dissolve in the society by doing the same thing that other people are doing and by believing others thoughts.

The reason for conformity, can be peer pressure, social pressure etc.

As, people of similar age group, religion, educational status, culture, tends to follow same of similar behavior and attitude.