Autocomplete feature is introduced by Microsoft in their web browser Internet Explorer (IE) since IE version 5. In the earlier version, it was limited to the auto completion of web addresses that you type in the browser's address bar. The later versions of IE included autocomplete support for various form elements including email addresses and passwords. If enabled, autocomplete feature lists possible matches for the entries you have typed before in the web based forms. It can be enabled or disabled from Tools » Internet options » Content » AutoComplete. As a user, you can enable (turn ON) or disable (turn OFF) autocomplete feature for web addresses, forms and user names & passwords on forms. You can also delete previous autocomplete entries/values of these things. To delete an individual value, select it from the drop-down list for that field, and press delete.

If you have enabled autocomplete feature in your Internet Explorer, and if you have already typed your name in one of those web based forms (you must've done this several times!), you should see the name(s) listed in the drop-down box just below the input box, as you start typing -

Your Name should be listed here :

This is achieved without adding any additional code, as name of the input field happens to be name, which is common for web based forms. The HTML code for the form shown above is as follows -

<form>
<b>Your Name should be listed here : </b>
<input type="text" name="name">
</form>

As you can see in the code, the input tag shown in bold does not require any additional coding. If the user has already typed the value of the field before, those values will be available here (values of field "name" in this case). This is very convenient for a user when he has to enter his name, email address in various web based forms time and again. Also, this proves very useful for a web developer because there is a lesser probability of incorrect information due to typographic error from the user end. Except in case of shared computers, most users would want to keep this feature on to ensure less wear and tear to their fingers and keyboards.