The Standard for Wireless Personal Area Network (WPAN) has been given by IEEE 802.15.4-2003 these networks are consists of Low rate, Low powered, Low memory devices. ZigBee Alliance has provided Network layer specification and PHYsical layer (PHY) and Medium Access Control (MAC) specification has been given by IEEE. In general the networks are of two kinds Tree/Mess. In tree network no routing table is required for routing. After the great success in PAN this technique has also been tried to apply in business Network too.