What do you declare in Rīchi Mahjong when you've drawn your winning tile?

In Rchi Mahjong, "Tsumo" is declared when a player has drawn their winning tile from the wall or another player's discard and completes their hand for a winning combination. Tsumo refers to a self-drawn winning tile, distinguishing it from other winning declarations in Mahjong such as Ron, where a player wins by claiming a discard made by another player.