Data mining is described as the process of extracting patterns from large amounts of information collected from the internet. The amount of information on the internet is estimated to double every three years. Data mining, since information is gathered in bulk and statistical figures, is commonly used for good reasons like marketing, surveillance, fraud detection and scientific research. The aim of data mining is, more often than not, to discover what data from a large number of users represent.
The point is, although data mining is not bad, the technology used to implement it is available to anyone online. Every website that you go to has the potential to "mine data" from you. Against this, every user who is concerned with their privacy, is left with three options. First, they can study the technology and come up with their own technology to prevent possible internet privacy invasion. Second, they can look for available technology that deal with privacy invasion. Lastly, of course, there is the option to not use the internet at all.
If you go with the second option, then you should consider history cleaners. Really, if you don't have the time to learn Decision Tree Learning, nearest neighbor, naive Bayesian classification and neural networks, then you're better off checking the commercial history eraser software products that deal with privacy invaders. The basic concept of history cleaners is to properly delete all the tracks and traces that you leave behind when surfing the internet. Other than slowing your computer down, these files almost volunteer everything that you have or do on your computer. You don't need'em so why keep'em.