cookie can also track one's preferences to show them websites that might interest them. Cookies make more websites free to use without any type of payment. Some of these benefits are also seen as negative. For example, one of the most common ways of theft is hackers taking one's username and password that a cookie saves. While many sites are free, they sell their space to advertisers. These ads, which are personalized to one's likes, can sometimes freeze one's computer or cause annoyance. Cookies are mostly harmless except for third-party cookies. These cookies are not made by the website itself but by web banner advertising companies. These third-party cookies are dangerous because they take the same information that regular cookies do, such as browsing habits and frequently visited websites, but then they share this information with other companies. Cookies are often associated with pop-up windows because these windows are often, but not always, tailored to a person's preferences. These windows are an irritation because the close button may be strategically hidden in an unlikely part of the screen. In the worst cases, these pop-up ads can take over the screen and while one tries to close them, they can take one to another unwanted website. Cookies are seen so negatively because they are not understood and go unnoticed while someone is simply surfing the internet. The idea that every move one makes while on the internet is being watched, would frighten most users. Some users choose to disable cookies in their web browsers. Such an action can reduce some privacy risks but may severely limit or prevent the functionality of many websites. All significant web browsers have this disabling ability built-in, with no external program required. As an alternative, users may frequently delete any stored cookies. Some browsers (such as Mozilla Firefox and Opera) offer the option to clear cookies automatically whenever the user closes the browser. A third option involves allowing cookies in general but preventing their abuse. There are also a host of wrapper applications that will redirect cookies and cache data to some other location. Concerns exist that the privacy benefits of deleting cookies have been over-stated. The process of profiling (also known as "tracking") assembles and analyzes several events, each attributable to a single originating entity, in order to gain information (especially patterns of activity) relating to the originating entity. Some organizations engage in the profiling