A browser, or more accurately, user agent, is the software used to access a website. Examples of user agents are "Explorer" (for Microsoft Internet Explorer), "Netscape" (for Netscape Navigator), and "Googlebot" (an automated robot that scours the web for website content to include in its search engine).
A web browser is a software application for retrieving, presenting, and traversing information resources on the World Wide Web. An information resource is identified by a Uniform Resource Identifier (URI) and may be a web page, image, video, or other piece of content. Hyperlinks present in resources enable users to easily navigate their browsers to related resources.