Networks and security - how to securely connect the digital world. Data exchange can be quickly and efficiently achieved through different types of networks. A Local Area Network (LAN) is ideal for smaller, more local networks such as those found in homes, businesses, schools, etc. A Wide Area Network (WAN) is designed for larger areas, even allowing computers in different countries to connect. An Intranet is a private enterprise network for an organization's employees to communicate and collaborate. The largest network of them all is the Internet, connecting computers around the world.

However, we must guard against potential interception of communications. That's why we have cryptography, a field of study focused on encoding and decoding information using special algorithms to ensure only the sender and receiver can know the content of the message. In addition to cryptography, other measures such as antivirus programs and Artificial Intelligence (AI) can be used to protect data, programs, devices, and networks. However, AI can be used by hackers to attack, making it a double-edged sword.
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