A browser is a software application used to access and view web pages on the internet. It acts as an interface between the user and the web. When a user requests a web page from a particular website, the browser retrieves its files from a web server and then displays the page on the users screen. The purpose of a web browser is to fetch content from the World Wide Web or from local storage and display it on a users device.

Some key features of a web browser include:

• URL Input: A user inputs a Uniform Resource Locator (URL) into the browser to access a specific web page.
• Rendering Engine: When the web browser fetches data from an internet-connected server, it uses a piece of software called a rendering engine to translate that data into text and images.
• Tabs: Tabs allow users to open multiple websites in a single window.
• Bookmarks: Bookmarks allow a user to select specific, predefined-by-the-user websites.
• Plug-ins: Plug-ins can extend the capabilities of the browser, allowing users to add security features and perform other tasks.

In summary, a browser is a program that allows users to access and view web pages on the internet. It retrieves information from other parts of the web and displays it on a users desktop or mobile device. The information is transferred using the Hypertext Transfer Protocol, which defines how text, images, and video are transmitted on the web.