Business data communications is the process of exchanging data or information between computer applications using electrical, optical, radio, or satellite transmission systems. It is also known as computer networking and involves four fundamental characteristics - delivery, accuracy, timeliness, and jitter. By understanding the fundamentals of data networks, one can learn how modern data works and how it plays a crucial role in corporate computer applications and everyday activities like web browsing and email.

Packetization is the process of breaking down user data into small segments or packets that can be transmitted and reassembled across the network. This technique is used to send data as small blocks of information, instead of a continuous stream like circuit switching. Each packet has two parts - the body which carries the data and the header information that aids delivery and is discarded by the receiver once the packet is processed. Packet switching is preferred over circuit switching as it enhances network utilization by aggregating network data traffic, making it smoother and more efficient.

Internet traffic is considered "bursty" compared to voice traffic, as it occurs in gush with long periods of silence. Internet users typically request instant information, generating burst traffic, and then keep a period of silence to process the downloaded information before requesting more data. Understanding these concepts is crucial in today's world where computer networks play a pivotal role in daily activities and have several benefits such as increased productivity, efficiency, cost-effectiveness, storage efficiency, flexibility, and data security.

The traffic flow generated by an individual user on the internet can be quite sporadic and unpredictable. Packetization is the method of dividing data into smaller segments, called packets, for easier delivery and reassembly across a network. Each packet consists of a header and body, with the header containing the recipient information and the body, the message information.

Routers serve as the bridge between multiple networks, with their ability to locate other routers even if they are not directly connected to either the sender or receiver. Enhanced robustness is achieved with the real-time packet switching that routers can do. As long as a router can find another router to connect within the network, it will remain connected, supporting the motivation for robust packet switching.

One significant advantage of using similar packets for transmitting voice and email on the internet is the versatility that comes with it. Devices such as PCs, laptops, mobiles, or hubs capable of network communication can easily establish a connection. The use of standardized packets for both voice and email transmissions simplifies the process and streamlines security measures. It is noteworthy that while sending data on the internet may be unreliable, transferring voice messages is encrypted and secure, making it possible to send emails safely using similar packets.