 Talking is easy, right? We all do it every day, whether it's in person, by email or by text. But what happens when something goes wrong? What happens when what we're using to communicate just isn't reliable, reliable, la la la la la la. We use protocols. Protocols is a fancy word for a simple concept, communicating formally. The stock market's doing so poorly, what shall I do? Not like that. Pilots use protocols. The communication has to be reliable and efficient. They have to be able to communicate with other planes and various airports in order to stay safe. For example, how do they report their positions? What happens if they don't understand what was said? What happens if they don't hear back? We can get into some pretty cool good situations. So what runway should we use? I think you said land on the cake. Okay, we're landing on the cake. What now? To avoid this, we use protocols. Protocols are a way to formalise communication, such that we don't get ourselves into trouble. That's why pilots are always a pedic snuff, always a pedic snuff. And use special code words to avoid being misheard. Christchurch Town, Charlie Charlie Elford Bridge, Eastern Firebreak, 1500. We have information, Juliet 10344POV, request landing on the runway. Pilots, emergency services, law enforcement, surgeons, builders and even you use protocols every day. They are essential to effective and efficient communication. Scavel. A lot of people think that internet is bulletproof, but it's not. Messages are lost, corrupted and delivered out of order all the time. Think about when you send a message on Facebook. If we didn't have protocols, it would look something like this. Luckily, the message arrives on the other side of the world just fine. The protocol is in place to ensure each word or letter is delivered properly. And if need be, they are recent. In this chapter, you'll learn about protocols such as TCP and UDP, which we use to build awesome applications on the web. Even people in the film industry use protocols. For example, to finish filming, people say cut. Is it cut? All sorts of people use protocols. But in this chapter, guys? See you tomorrow, Sam. Are you still filming?