Explore the intricacies of network communication in this engaging conference talk from JSConf EU 2018. Delve into the world of TCP, package delivery, and the fundamental processes that enable global internet connectivity. Discover why data is divided into packets, how they traverse the globe, and what happens to lost packets. Gain valuable insights into the link layer and its crucial role in network performance. Perfect for developers seeking a deeper understanding of the underlying mechanisms that power the internet, this presentation offers a fresh perspective on optimizing web applications by focusing on the foundational elements of network communication.