#Networks and Security, or How to Connect the Digital World

How can we exchange data quickly and efficiently? 
There are computer networks for this, and there are different types of networks for different needs:
A local area network, or LAN, is for small networks, like those used in homes, offices, and schools.
A wide area network, or WAN, works on the scale of cities, and sometimes even supports international connections.
An Intranet is a private network, usually run by enterprises to support private communication within the organization. An Intranet can support employees communicating, collaborating, and performing their roles, with minimal risk of exposing sensitive data outside of the network.
And of course there's the Internet, perhaps the most well known network of all. It supports global communication with open access to connect machines and people around the world.

A primary concern with any network is security. Secure and private communications face attempts to intercept the information on the network. Researchers are constantly trying to find and patch vulnerabilities that could be exploited by hackers.
Cryptography is a key part of the solution. Cryptography is a field of study focused on algorithms for encoding and decoding information. When done properly, this allows only the sender and intended receiver to read the content of a message.
There are many ways to protect your data, programs, devices, and networks. Aside from cryptography, antivirus software can check for suspicious activity. Artificial Intelligence, or AI, has also been employed to defend networks from hackers. But many of these same tools, including AI, can be used by hackers to find new exploits. It's a constant arms race for network security researchers.
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