How is auto fill helpful? explain with example

auto fill, from my understanding will automaticalls fill out information for you when your creating a new acount with something.
ex:

Age:
Name:
State:
Country:
E-mail:

auto fill will fill in the information that it already knows about you

Autofill is an option that usually found in web browsers allow you to fill out the commonly enters information. This information might be the name of any website, address, E-mail, etc. Autofill is very helpful because with this feature you don’t need to fill the information again and again. For instance, suppose you are searching for an Auto CAD jobs on any job portal if you are a regular visitor of that site when you will type then site fill your information automatically by fetching your previous data.
More Job Related Quires :- http://www.monsterindia.com/auto-cad-jobs.html