Answer Wiki. An MRI is a series of detailed picture of your brain, as they were at the time the MRI was done. They are valid as long as no other changes occur. Basically, if somebody has an MRI today that is normal, and have a stroke or hernia tomorrow, obviously the result will change (You never know).
Web browser. A web browser (commonly referred to as a 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/URL) that may be a web page, image, video or other piece of content.
Quick Answer. A Web browser is a program used to visit websites, while a search engine is a website that allows you to look for specific websites or information based on keywords, dates and other criteria. Common examples of Web browsers include Internet Explorer, Safari, Firefox and Chrome. Common examples of search engines include Google, Yahoo!, Bing and Ask.