  The concept of energy-efficient computing is not new but recently the focus
of the industries related to technology has been shifted towards energy
utilization techniques with minimum energy loss. Computer Networks also needed
to be energy efficient. Energy Consumption is also an important challenge in
the Wireless Sensor network. Energy efficiency can be achieved with the help of
clustering algorithms, energy-efficient routing methods, improved data
aggregation schemes, and energy-efficient MAC protocols for WSN.
