bookmark in a Web browser

A bookmark in a Web browser is essentially the same thing as a bookmark in a book.
It saves the page URL/location, allowing you to come back to it whenever you may need to.
It saves the user from remembering their exact path to finding a certain website or page.

the function of a browser's bookmark

To create a convenient link to a web page.

a bookmark in a browser

Much like a bookmark saves your place in Moby Dick or a Harry Potter book, it saves the URL of the webpage to a file on your local machine, so that you can come back to it in the future.

web browser allow to do

The web browser allows you to view the sight that you are visiting and it has a firewall to protect agents viruses