It's probably the first word a baby learns.
The first word you say when you greet someone.
The first word you say when you pick up the phone.
The word that you say when you're frustrated by your stupidity ("HELLO?! What was I even THINKING?")
It's such a universal word. You can go to another part of the world, and say "Hello", and they will understand. (So, technically, you know at least one word in every language). The very word itself brings a sense of hospitality when you greet someone. What a simple, yet, sophisticated word it is.
Of course, "Hello" may not always be so kind. It all depends on the tone in which you say the word. Are you greeting a houseguest? Are you greeting an enemy? Are you reluctantly greeting someone that you didn't want to meet? They all belong in a different tone of voice.
As you already know (and I assume that you do...if you're capable of reading this article, then you're old enough), "Hello" has many uses. That is why you can see the word being used in every aspect of life. Maybe it's that Target commercial..."You say goodbuy [they changed it to goodbuy for the commercial version], I say hello, I say hello." Or maybe it's Lionel Richie's infamous Hello song? Oh, and how about that little voice that suddenly pops out of your Motorola phone when you turn it on?..."Hello, Moto."
You yell "Hello?" in a store to see if anybody is there. You ask "Hello?" to see if someone has occupied a fitting room. You say "Hello?" while poking an animal to see if it's dead. You say "Hello" to someone because...well, you have nothing else to say to them.
But as always, "Hello" will always become the start of something new. Try saying "Hello" to new dreams, and greet the future. Don't mind saying "Hello" to a new student in your class. Who knows? They might become a life-long pal.
P.S. I just noticed--this is our 50th article on the blog! -throws confetti- Here's to another 50...or 100...or 1000...or 10000000000000 more!