How is the freezer part of a refrigerator is more cooler than the other parts?

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The freezer section of a refrigerator is colder than the fridge due to the refrigeration cycle, where a refrigerant is compressed, cooled, and then expanded. This expansion lowers the temperature of the refrigerant, allowing it to absorb more heat from the freezer compartment. In combined fridge-freezer units, two throttles are utilized: one for the fridge and one for the freezer, enabling the freezer to reach lower temperatures. The design of the system ensures that the refrigerant is expanded more significantly for the freezer, resulting in its colder environment. Understanding this cycle clarifies why freezers maintain lower temperatures than refrigerators.
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please explain me..
 
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Both freezers and fridges work on a 'refrigeration cycle' http://en.wikipedia.org/wiki/Refrigeration_cycle.

A working fluid (refrigirant) vapour is compressed so it heats up, it then passes through an condenser to cool it down to a liquid. This is then throttled, it's pressure is lowered, which drops the temperature. It's then passed through the fridge to cool the air inside.

The key to why a freezer is colder than a refrigirator is that the working fluid is throttled through an expansion valve to a lower temperature.

http://www.howstuffworks.com/refrigerator4.htm
A summary. The fuild inside the fridge freezer plumbing cools when expanded. In the freezer it is expanded more to allow it to drop to a lower temperature.

In combined fridge freezers that run off 1 system. Two throttles are used, one that goes to the fridge and the other goes to the freeezer.
 

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