旅行 (ryokō) means "travel," "trip," or "journey." You use it to refer to going from one place to another, especially over a considerable distance, often for pleasure or exploration. It involves visiting new places. For example, 「来月、旅行に行きます。」 (I will go on a trip next month.)

ある場所から別の場所へ行くことです。休暇や観光で出かけるときに使います。「来月、旅行に行きます。」