Browsers enable the sending of encrypted data over the Internet.
Browsers can operate in two modes, normal and secure mode. You can tell which mode your browser is in by looking at the right-bottom of the browser window. If you see a broken key or an open padlock, you are in normal mode. Every time you access a secure page the key becomes whole, or the padlock becomes closed. Of course, this is only necessary on such pages where your confidential information is being entered, not on the regular pages of the website.