I think our Culture is something we should all be more aware of.  Not in a Patriotic or Nationalistic way but more the way a particular  (sub)culture  develops and stabilizes.  Firstly, definition game  again...      I first want to start with culture, so without the sub...  There are some diferent uses ot this word so i'm going to pick some  definitions from different sources that point towards the one i want to discuss on this page.  

culture noun   1)   the customs, ideas, values, etc of a particular civilization, society or social group, especially at a particular time.

cul·ture noun 
a : the integrated pattern of human knowledge, belief, and behavior that depends upon the capacity for learning and transmitting knowledge to succeeding generations

b : the customary beliefs, social forms, and material traits of a racial, religious, or social group; also : the characteristic features of everyday existence (as diversions or a way of life} shared by people in a place or time

cul·ture   [kuhl-cher]
3. a particular form or stage of civilization, as that of a certain nation or period: Greek culture.

   Also : "to culture"

4. development or improvement of the mind by education or training.  

   In the same place, adding the "sub" 

5. the behaviors and beliefs characteristic of a particular social, ethnic, or age group;
the youth culture; the drug culture. 

 Diferent place, but in my opinion also "sub" 

c : the set of shared attitudes, values, goals, and practices that characterizes an institution or organization;
a corporate culture focused on the bottom line. 

Before i go any further (and if you haven't been there yet),
 have a quick look  at the first bit of this page:    

   

If you Can agree with That Picture, Can you Agree with This?

NoBody Is Wrong...

  my Main Definition of Culture would be; 

 Culture is the Behavior  that someBodys have Accepted as Normal.  It is the things we do Without Wondering Why, it is the things that are part of our Beliefs and Truths...

   'We' put a lot of emphasis on 'the Importance of Education'...  Why? (and Who?)   Education is important 'otherwise you never get a good job'...  (lesson One, without it being put in somany words, you need 'employment' to be happy/successful.  even wanted?)  

   After being formally 'Educated' doesn't it Just Continue by the Media, 'Sales-reps', Specialists?

  ...
 SubCulture.  

    'Sub'cultures Develop and Maintain themselves  because of  'Lack of Mingling'....

(Birds of a feather Flock Together,What you Sow you will Reap and What Comes around Goes around.)

   There is in our society a large 'Group of Sub-Cultures' that are hardly ever described as such.  In the "official" definitions of Sub-Cultures, concepts like  "Youth Culture" and  " the Drug Culture" are often mentioned.  

I would like to Add some More: 
  Politics.   The Military.    The Health Care System.   Education....
  

For a better understanding check

otherwise, why not have a look here;