What is a Web Browser?
A web browser is an application software that allows users to interact and display contents of web pages. Contents of web pages can include images, text, music, video or other information that is available on the Internet. Web browsers allow users quick and easy access to available information by providing hyperlinks to other web pages.
Web browsers use html and http to allow web pages to communicate and interact with one another. Web browsers differ from one another on the way that they interpret html so the display of web pages may differ from one web browser to another. Use of web browsers however are not limited to the internet, they also can be used to access private networks or content in file systems.
Source: Wikipedia.org