A network is a medium that supports communications between servers and clients, following the request-response messaging pattern in which a client sends a request to the server and the server responds to the request by using this medium. A typical example of a network is the internet, which enables us to communicate with all devices connected to it. Today, there are tons of devices that can be connected to the internet, including computers, tablets, smartphones, Arduino, Raspberry PI, and others. The use of these devices has enabled the growth of the Internet of Things (IoT), giving us the chance to innovate and create a new era of applications. There are also other sorts of networks, such as Bluetooth, LiFi, LAN, and so on, that can be used to allow interaction between clients and servers, depending on business needs.