Congratulations is what you say to celebrate someone's achievement or good fortune. When your friend wins the spelling bee, makes the soccer team, or gets a new baby sister, you might say “Congratulations!” to share their happiness and recognize their success.

The word signals genuine happiness for someone else. It expresses that you truly appreciate what they've accomplished or experienced. Someone might offer congratulations when you ace a difficult test, earn a role in the school play, or finally master a challenging piano piece you've been practicing for months.

You can also use the word as a noun: “She received congratulations from everyone in her class” or “My congratulations go to the whole team for their hard work.” People sometimes shorten it to “congrats” in casual conversation.

The feeling behind congratulations matters more than the word itself. When you congratulate someone sincerely, you're celebrating with them, not for them. You're saying their success brings you joy too. That's why receiving heartfelt congratulations often feels as good as the achievement itself: it means someone noticed your effort and cares enough to celebrate it with you.