You can attack twice instead of once whenever you take the Attack action on your turn.
Extra Attack
Raw data
{
"name": "Extra Attack",
"page": 103,
"level": 5,
"srd52": true,
"__prop": "classFeature",
"source": "XPHB",
"entries": [
"You can attack twice instead of once whenever you take the {@action Attack|XPHB} action on your turn."
],
"className": "Monk",
"classSource": "XPHB",
"basicRules2024": true
}