CS50 Fall 2025 - Lecture 8 - HTML, CSS, JavaScript (live, unedited)

In this CS50 lecture, the speaker transitions from command-line coding to web app development, explaining how the internet works by detailing networks, routers, and the history of ARPANET. The lecture covers essential internet protocols such as TCP/IP, IP addresses, and port numbers, using analogies and skits to illustrate data packet routing. Further, the speaker introduces DNS, DHCP, HTTP, and HTTPS, then dives into web development languages, including HTML for structuring web pages, CSS for styling, and JavaScript for interactivity, demonstrating how to use these tools to create basic web pages and interactive elements.