This is the 3948th most frequent Japanese word.
ション
"ション" is a katakana transcription used for the English suffix "-tion."
Here, ション appears at the end of 'デモンストレーション', which is a loanword from English 'demonstration', used in the context of showing or demonstrating something.
彼は新しいゲームのデモンストレーションを見ました。
He watched the demonstration of the new game.
In this sentence, ション is included in the word 'オプション', also derived from the English 'option', referring to choices or settings.
その編集ソフトには良いオプションがたくさんあります。
That editing software has many good options.
The word 'プレゼンテーション', containing ション, comes from the English 'presentation', indicating the act of presenting or showing information through a formal mode.