What is round robin in DNS?

Round robin: enables us to set multiple records of a given host name. and distributes the ip address in order. 

Ex:

Create a host name in dns as www. www.izone.com with ipaddress as 192.168.1.100

Create the same hostname with 192.168.1.200

Create the same with 192.168.1.300

When we try to ping the www.zone.com

Reply's as 192.168.1.100, 192.168.1.200, 192.168.1.300

Again ping www.izone.com

192.168.1.200, 192.168.1.300, 192.168.1.100

Again ping www.izone.com

192.168.1.300. 192.168.1.200, 192.168.1.300

So the order keeps on changing.