What is mean of System.out.Println ?

Answer 1

System -is a class

out -is a reference variables of Prinstream class which store as static in System class

println -is simple a function of Prinstream class

Answer 2

Additional info:
println= print line . 👍
Do not mistype it as printIn(print In)

Answer 3

I'll respond with another question: how deep do you want to go into this? The simple answer is it displays text in your console. However, it's secretly way more deep and only few days ago I gazed into this abyss.