Using noindex nofollow Meta tag to protect admin pages
Most search engines understand html and Meta tags help them understand what to do when they visit your website. For example if you want search engines read a specific title, you can use meta title tag for this purpose. Similarly you can use meta tag to protect your admin pages or certain pages that you do not want search engines to list.
These tags are called no index and no follow
If you use both the tags on one page search engine will neither index the page nor it will follow your page for further updates.
Benefit of using no index tag
The most important benefit of using no index tag is to protect admin pages in a website of software application. Other than regular security tricks you can use meta tags to avoid search engine listings.