Final answer:
Digital signals are more suitable for modern communication systems than analog signals due to ease of encoding for secure transmissions, clearer data transmission in weak signals, and compatibility with digital circuits that use binary code.
Step-by-step explanation:
The fact that digital signals can easily be encoded for secure transmissions such as wifi, while analog signals are harder to encode and decode, supports the conclusion that digital signals are more suitable for modern communication systems. Digital signals, represented by a sequence of binary ones and zeros, allow for clearer data transmission, even when the signal is weak. They also enable the use of computer algorithms to compress data, allowing for the transmission of larger amounts of information over a given frequency range. In addition, the fact that digital signals use discrete voltage levels makes them better suited to being processed by digital circuits found in electronic devices like computers and cell phones, which rely on transistors functioning as on-off switches.
In contrast, analog signals continuously vary and do not have the benefit of simple digital encoding and error correction. While superposition of signals and modulation can be applied to analog signals, the inherent advantages of digital signal processing, especially in the context of security and information capacity, make digital signaling the more efficient and reliable method for most modern communication technologies.