More specifically, it's getting a name as mentioned above, but doing it as soon as it becomes available to minimize the risk of someone else getting it. So basically what you do is get a minecraft account, then as soon as a name becomes available, you change the name.
So-called "snipers" are programs written to automate this process, theoretically allowing for catching a name faster than any human can react. In practice this does not always work out, and I for one do not know why

https://gyazo.com/bbf25dc3cd532b9a851f021129d6b8e8and, a sniper is a service (typically a website) where they charge you $5 (+/-) and you enter your login details and a bot, usually super quickly grabs the name the second its available.
I personally use https://Chearful.ninja
Means the names taken alreadyhttps://gyazo.com/bbf25dc3cd532b9a851f021129d6b8e8
What does that mean?
