NEED information about DNS in w5500 chip


    i am new to this w5500 chip and i did tcp, udp with the help of drivers which are downloaded from site. No i want to do dns. as of now i don't know what it is exactly.because this is first time i am working on this technologies. so could you please explain exactly how dns will work in w5500 chip.( i am thinking if we enter one url it will give ip of that url). is it right if right what is the use of that one.

  Please explain clearly..