An internet service provider (ISP) is a company that provides web access to both businesses and consumers. ISPs may also provide other services such as email services, domain registration, web hosting, and browser services.
The purpose of a web browser is to fetch information resources from the Web and display them on a user's device. This process begins when the user inputs a Uniform Resource Locator (URL), such as wikipedia.org, into the browser.
A mobile browser is a web browser designed for use on a mobile device such as a mobile phone or PDA. Mobile browsers are optimized to display Web content most effectively for small screens on portable devices.