Theory:

You might have seen in the movies or the tourists from abroad visiting our country. They are distinct from us both physically and culturally. Even within the country, we can spot such differences. People from China are mostly shorter than Indians, compared to that of Europeans, who are naturally tall in appearance.
Race is defined as “a category of humankind that shares certain distinctive physical traits.” i.e.in other words, race can be defined as a biological grouping within the human species, i.e. “Race” is usually associated with biology and linked with physical characteristics such as skin colour or hair texture.
The most widely found human racial types are based on visual attributes such as head shape, facial features, nose shape, eye shape and colour, skin colour, stature, blood groups etc.,

The major world Human races are
  • Caucasoid (European)
  • Negroid (African)
  • Mongoloid (Asiatic)
  • Australoid (Australian)
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Caucasoid
It is also known as the Caucasian race. People those having light to fair skin are traditionally classified as Causasoid. It is a European race generally found in Eurasia.
 
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Characteristics
  • Fair skin
  • Dark brown eyes
  • Wavy hair
  • Narrow nose
Negroid
The term is used for people from Sub-Saharan Africa. They are living in different parts of Africa.
 
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Characteristics
  • Dark skin ranging from dark brown to black
  • Woolly or frizzly black hair. Little or sparse body or face hair
  • Long round head with a protruding occiput region
  • Wide and flat nose.
  • The eye colour is from dark brown to black
  • Lips are thick and everted
Mongoloids
The mongoloid race is generally known as the Asian-American race. The Mongoloid race is found in Asia and the arctic region. It is subdivided into several smaller races: North Asiatic, Arctic, South Asiatic, Far East, and American.
 
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Characteristics
  • Straight hair (Sometimes wavy)
  • Yellow to brown skin
  • Flat face with prominent cheekbones
  • Broadhead
  • Medium nose with low nose bridge
Australoid
The Australoid is a racial classification that is used in reference to the people of Southeast Asia, South Asia, Melanesia, Australia, and other regions in East Asia.
 
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Characteristics
  • Wide nose
  • Curly hair
  • Dark skin, and
  • Short in height
Races of India
India has a diverse population and known to be one of the cradle lands of human civilisation. Ancient Indus valley civilisation was believed to have been of Dravidian origin in northern India. On the advent of Indo-Aryan and the conflicts between the two races, Dravidians were pushed to the south. 
 
South India was dominated by the three mighty Dravidian kingdoms, the Chera, the Cholas, and the Pandyas. The Dravidian languages are Tamil, Telugu, Kannada, Malayalam and Tulu. Almost all the Dravidians live in the southern part of India.