Sat Sri Akaal is a greeting commonly used by Sikhs, and it means "God is the ultimate truth." It is a way to show respect to both the person being greeted and to God.
Imagine you're meeting someone new, maybe a friend of your parents. Before you say hello, you might want to show respect to the person and to God. You can use the phrase "Sat Sri Akaal" to do that.
Think about what it's like when you tell the truth. People trust you more, and they know they can count on you. Well, just like how telling the truth is important, Sikhs believe that God is the ultimate truth. So when they say "Sat Sri Akaal," they are saying that God is the most important thing and that truth is important.
So "Sat Sri Akaal" is a special greeting that shows respect to people and to a belief in truth and God.