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In the design and developemenet process of any website or web base system you can find that there are a lot of phases you need to undergo.Design and devlopment process will have process from gathering infomation to create and maintain a website. If you break down a huge design process into few main sub processes...
When you visit a website, CSS and Java script files are downloaded to web browser before execute the code in that web page. Many web pages of many websites consist of same data most of the times. For instance a web site will use the same set of image, favicon, same text or there is a chance to use same CSS or Java Script files. In a case like this, every single time user browse through different web pages, it would be much easier for the website to load the files from local machine rather than downloading all the files from web server. Therefore, the browser downloads web files once and stores them on the local hard disk so that the loading time of web pages become much quicker. Otherwise as shown in the above diagram, it will take considerable amount of time for a webpage to download to your browser. The process of downloading web files and storing them in the hard disk is called cashing. The cache files are used to increase the quickness of data loading while browsing. Most of the times when you access a web page, web files are downloaded to the cache on the hard drive. and when you access the same page again browser will load the web page from the cache files stored in your hard disk rather than going all the way to the web server.
Prior to the use of Internet explorer 10, previous versions of Internet explorer were using a file called "index.dat" to store cookies, history and temporary Internet files. Many tools were developed by experts to retrieve browsing history, cookies and temporary Internet files. Criminals found these developments very interesting because they could permanently delete index.dat files using these newly developed technologies. Therefore, nothing related to browsing history, cookie files or temporary Internet files were available to the forensic experts to track these criminals down.
But Internet Explorer 10 has stop using index.dat and previously used index.dat has been replaced with ESE database known as Jet Blue. Extensible Storage Engine is a database engine developed by Microsoft and it is specifically an index sequential access method data storage to store web browsing information such as cookies, browsing history, visited URLs.