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Packets are the essence of web communications and in this video we discuss packet basics and how they can be manipulated to attack and exploit web apps. We discuss what a packet is, what makes up a packet in terms of its fields, and how to capture packet data using packet sniffing tools such as wireshark. In addition, we examine packet responses in the form of HTML status codes. Finally, the importance of packets in web app exploits is discussed with regards to hidden HTML form fields and how apps are tricked into giving up sensitive info via packet manipulation. An example of such manipulation is the creation of fake browser cookies.