Culture affects perception, and perceptions drive behavior. Thus, the culture we belong to, has a direct impact on our behavior. Moreover, our environment, which has cultural influences, shapes our behavior. In a society where boys are discouraged from crying, men think of it as an odd gesture. If the values of a certain culture do not teach men to respect women, it will naturally reflect in their behavior. Behavioral and communication etiquette are a part of our culture. What our culture teaches us affects the way we interact socially. People from some cultures are found to be more open in communicating even with strangers or new acquaintances, while those from conservative cultures may not be so open. The difference between ideologies their cultures have, are thus evident in their social behavior.
Our culture defines our standards of personal space. The term proxemics, coined by Edward T. Hall, is defined as the interrelated observations and theories of man's use of space as a specialized elaboration of culture. The distance we maintain during communication is largely impacted by the culture we belong to. Our gestures, overall body language, and the degree of physical contact made during communication is affected by our cultural norms.
Our faith and morals which are a part of our culture, affect how we behave. Our morals influence our feelings such as shame and pride, and our faith defines what we perceive as right or wrong, thus affecting our behavior. You still ask why culture is important? See how it defines our personalities.
Read more at Buzzle: http://www.buzzle.com/articles/why-is-culture-important.html