what is the up and down in document.addEventListener java code example

Example 1: javascript keydown

document.addEventListener("keydown", function(event) {
  if (event.keyCode == 32) {
    console.log("Space was pressed!");
  }
});

Example 2: keydown events

document.addEventListener('keydown', logKey);

function logKey(e) {
  log.textContent += ` ${e.code}`;
}