A firewall can be a hardware or software program that is designed to prevent outsiders from accessing your computer or network, and in some cases, used to prevent applications already located on your computer to access the Internet to transmit back to a host. These applications can be understood as a relationship / server to the client. The program is installed on your computer can be referred to the client, and where the client gets the information that is designed for capturing, connects to the server to transmit data.
Some of the programs installed on your computer, such as free software that enables P2P to share music or movies, usually referred to as adware or spyware, and which gather information about you such as geographic location, websites that you visit After age and sex, and then determined based advertising on this information. Some programs are more insidious to the point of capture credit card numbers, social security numbers, birth dates and account numbers and try to convey this information to a server computer.
Ideally, you will want a firewall that blocks not only Internet connections, but also alerts you if a program already on your computer is trying to connect to the Internet. Some of the programs installed would of course have a valid reason to try to connect to the Internet, such as an antivirus program that needs to connect to a server to download the latest definitions to protect your computer against the latest types of infections. You may also have an operating system that is needed to connect to the server manufacturer to download the latest security fixes or patches.
There is a wide range of firewall available to consumers, both hardware and software based. Research is as much as possible and check with reliable sources and product or set of products that best fit your needs. My personal advice is to stay away from small companies and start-ups, instead of using one of the leading companies that are recognized as authorities. For example, Symantec and Network Associates are keenly aware of both companies to Norton and McAfee products. For hardware, you can look like Linksys or Netgear solid products created for use with daily average consumer. Again, these are just examples of personal taste, so do as much research as possible solution would be to determine which meet your needs if you own a home or a laptop with wireless WAN computer security manager with 1,500.
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