TV audiences

Demographics - In which media producers study the breakdown of their target audiences based on variables in age, ethnicity, gender, economic status/class, level of education, hobbies and interests, and lifestyle choices.

Psychographics - Profiling of audiences based on personal beliefs, values, interests, and lifestyle.

Some examples of different demographics:
Age
Gender
Race
Spending power
Class
Ethnicity

The NRS social grades are a system of demographic classification used in the UK. They were originally developed by the National Readership Survey in order to classify readers, but are now used by many other organisations for wider applications and have become a standard for market research.

The classifications are based on the occupation of the head of the household.

Grade	Social class	Chief Income Earner's Occupation (% of Pop. 2008)
A	upper middle class	Higher managerial, administrative or professional. (4%)
B	middle class	Intermediate managerial, administrative or professional (23%)
C1	lower middle class	Supervisory or clerical and junior managerial, administrative or professional (29%)
C2	skilled working class	Skilled manual workers (21%)
D	working class	Semi and unskilled manual workers (15%)
E	Those at the lowest levels of subsistence	Casual or lowest grade workers, pensioners and others who depend on the welfare state for their income (8%)