let's start with linguistic dependency: linguistic dependency is a concept in generative grammar proposed by Noam Chomsky, which essentially means that language is constructed of a set of rules for meaning. For example, 'daddies' depends on 'parents', but not vice versa. This means we can predict what words would be used to refer to fathers solely on the basis of their relationship with parents (for example, mommy).
Now, in relation to NLP, linguistic dependency is deeply related to the theory of topic and focus, which is why they are both a part of linguistic dependency.
So what does that mean for daily life? Well, I'll use iphone as an example since I am particularly familiar with it. iphone has a very simple user interface. In practice, A LOT of NLP goes on behind the scenes to enable this. For example, when you tap the keyboard to type, it knows that you are typing a word instead of a symbol (because of linguistic dependency), and then it puts a space after you finish typing each word. This way you can type one continuous sentence without pressing the space bar. iphone also has machine learning algorithms that predict what you want to do based on your past actions, such as opening an app or how you hold your phone when taking a picture.
This makes your phone a lot easier to use. In a sense, you are constantly taking part in NLP, but you don't even know you are doing it.
So how does this relate to our daily lives? Well, I'm not sure which one of these examples is more related: iphone or the other examples I've listed above. However, what they all have in common is that they are all relying on linguistic dependency in order to function properly. The word I'm looking for here is "function". Each of these devices has a function: let's call the first one, iphone, "The iPhone": an intelligent phone. However, it is not specifically designed to be intelligent. It is designed to be a phone that you can use to make calls and send texts.
Now let's change the word "function" to "purpose". In this case, iphone is a device that has been made for a particular purpose: making calls or sending texts. The iPhone was designed in order to fulfill this purpose. But it doesn't matter if iphone can make calls or send texts, none of that really matters, because this is not the function of the iPhone. What is the iPhone's purpose?
So what is its purpose? iphone has a very specific function: to fulfill human needs through manipulation of information. What does "information" mean? It means numbers, images, and sounds (which are images and sounds). And how does it fulfill human needs? iphone manipulates these numbers, images, and sounds in a way that affects people's minds. And this is it! As long as you understand the role of the iPhone (the function of the iPhone), everything else can be explained: the technology inside iphone (the purpose of iphone), how it does what it does (its effects on human minds), etc.
Now let's do this for something less obvious: cooking. Cooking is also information manipulation. When you roast a chicken, you manipulate information in order to make it taste better. This is the same reason people drink wine or beer with food: the combination of alcohol and food makes people feel better than just drinking alcohol by itself. Why does it work? Because alcohol affects your brain in a way that makes you feel good, and food affects your brain in a way that also makes us feel good (and I'm not talking about nutrition here).