Internet is a complex, decentralized, and dynamic system. Let's understand each of these characteristics in detail:

Complex System:
- The internet is a complex system because it is made up of a large number of interconnected elements such as computers, servers, routers, and data centers.
- It consists of various protocols, standards, and technologies that work together to ensure the smooth functioning of the network.
- The complexity of the internet arises from the vast amount of data being transmitted, the diverse range of devices connected, and the constant evolution of technologies and applications.

Decentralized System:
- The internet is a decentralized system as it does not have a central governing authority or a single point of control.
- It is composed of a network of interconnected devices, each with its own unique IP address, which allows for peer-to-peer communication.
- Decentralization ensures that the internet remains resilient and resistant to failures or attacks since there is no single point of failure.
- It also promotes freedom of expression and innovation, as users can freely access and share information without censorship or control from a central authority.

Dynamic System:
- The internet is a dynamic system because it is constantly evolving and adapting to new technologies, applications, and user needs.
- New protocols and standards are developed, existing technologies are upgraded, and new services and applications are introduced regularly.
- The internet's infrastructure, such as routers and switches, can dynamically route traffic based on network conditions to ensure efficient data transmission.
- The dynamic nature of the internet allows for scalability, flexibility, and the ability to accommodate the growing demands of users and applications.

All of These:
- Considering the above explanations, it is clear that the internet possesses all of these characteristics: complexity, decentralization, and dynamism.
- These characteristics collectively define the nature and functioning of the internet as we know it today.

In conclusion, the internet is a complex, decentralized, and dynamic system that enables global connectivity, information sharing, and communication. Its complexity arises from the vast network of interconnected devices and technologies. Its decentralization ensures resilience and promotes freedom of expression. Its dynamic nature allows for continuous growth, innovation, and adaptation to changing needs.