If you are surfing the net a lot then your computer might be full of cookies and temporary internet files, which must be controlled in order to speed up surfing. When you visit the sites, a lot of unwanted files get accumulated in the hard disk and we remain unaware of the issue. Internet explorer and Netscape navigator has an in built image cache file system that stores lots of images and applets form the sites so that when we log on to the site next time the site loads more quickly than before.
On the other hand cookies are small internet text files that keep track of our movements through the web pages. They do not occupy so much of space in the hard disk. Cookies also contain the log in information, such as user IDs and passwords. These are stored in order to facilitate fast online shopping where we need our personal information. Cookies help to automatically place the IDs and passwords in the forms. Cookies are added by the web programmers and they are seen only by us not by them. If you are using earlier versions of browsers then it can cause some problems as the programmers can change or modify the cookies in your local machine. That is why it is very important to update the browsers each time an update is available.
Sometimes it is not desired to delete the cookies form our machines. As cookies helps to remember the log in information and web site entities , this makes surfing a little bit slower as the sites do not recognize us next time, after deleting them. In fact we cannot prevent cookies form being accumulated in the machine. You can manually delete cookies and internet files or use some specific software to do it. We can search for the cookies in the windows folder and delete them.