For most home users, the operating system firewall comes with an established set of rules regarding what information can and cannot pass through it. When new information attempts to get through, for instance when a new program tries to utilize your Internet connection to upload or download information, you will be prompted by your computer to allow or deny this access. This typically happens when you are installing a new piece of software. If you trust that the software is safe, allow the connection. You can further customize your permissions manually, through your system’s firewall control panel, but this is only recommended for experienced computer users. The same goes for your router’s firewall settings.