A web browser allows users to view and interact with content like text, images, videos, and games located on web pages. Some tips for determining if a website is secure include checking for HTTPS in the URL, a lock icon, and using whois.net to research the domain. To evaluate a site's credibility, look for copyright information and check grammar and spelling. While FTP transfers entire files, HTTP only displays web page content in the browser. Personal information like phone numbers and addresses should not be shared online.