Explain this concept

Answer 1

loops are used to loop something for example a the code of a game

how a game works:

1.calculate where everything is
2.clear the screen
3.draw everything
repeat

so in code that would look something like this:

while(GameIsRunning){
calculate()
clearScreen()
drawScreen()
}

Answer 2

you need to be specific, learning it with a language will be good