Navbar is a small toolbar provided by blogger.com which is placed at the the top of your blogger blog. It looks like this:

Blogger Navbar

Blogger Navbar

Some people would like to remove this toolbar because it may not look good or may not match with the template.
Here’s how you can remove the navbar:

1. Go to Layout->Edit Html
2. Download Full Template
3. Check the Expand Widget Templates
4. Search for this code

<b:skin><![CDATA[/

5. Below the above code paste the code below

#navbar-iframe {
height:0px;
visibility:hidden;
display:none;
}

6. Save the Template

After this your navbar is completely removed.