To connect to the Internet, you must have a unique identity. It's called IP address. Computers use IP address to communicate with each other.
Concerned about your Internet privacy? Hide your IP address as it tells too much information about you.
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User agent is the information your browser sends to the web site. It includes your browser name and version as well as your operating system name and version.
A great place to explore more information about IP address or Internet security and other valueble knowledge.
Do you know even if you disable cookies some web sites can still identify you by the information your browser sends out? Check this out.