Proxy servers are typically used for security purposes, although they are also used
to block access and to apply content filtering rules, primarily to block sites that contain
material that the user wants blocked (i.e. adult content). Businesses often use proxy
servers to audit employee usage or to protect against data or information leaks
Proxy Servers are also used by businesses, including Internet Marketing Companies,
to augment their overall data handling capabilities. Often times, there are limits that
receiving servers have coming from an IP address; however with a proxy server,
the IP address is different. This method adds to the data handling and exchange
capabilities of companies that don't have an army of servers at the ready at all times.
There are other proxy servers available as well, although they are not as common.
At the end of the day, a proxy server is typically used to limit the information that is
accessed or to track the usage of a particular user or users. Primarily used in a business
setting, proxy servers can be used in a home setting as well - particularly by parents
hoping to limit the amount of offensive material their children have access to.