It is almost certain that if you have used a computer or the internet for some time you will have been in a scenario where Linux was playing a part in what you were doing. Now, you might be thinking that not only do you not know what Linux is, but you are also 100% certain that you have never used it.
That is a reaction that many people have, and it is not unreasonable simply because Linux is not something that is immediately recognisable nor is it especially prominent. However, we can say with as close to certainty as we can that you and billions of others come into contact with Linux almost every single day.
Linux is used by Google, Facebook, and Twitter, which are in the Top 10 of the most visited websites on the internet. To give you an idea of just how many visits they get, their respective daily visitors are 29 billion for Google, 7 billion for Facebook, and 1 billion for Twitter. Many others use Linux, so it is a fair assumption that every internet user has some kind of interaction with Linux daily.
Linux is an open-source operating system. Operating systems are used to manage all the hardware that is found in devices with the most obvious ones being desktop computers and laptops. Other examples of operating systems include Windows and Mac OS and the primary function of all of them is to allow hardware and software to communicate effectively.