The brand name for sticky notes (Post-it®): small adhesive-backed paper used for temporary notes that can be stuck and removed. Often used generically for sticky notes.
重要な用件を忘れないようにポストイットに書いて机に貼った。
I wrote the important task on a Post-it and stuck it to my desk so I wouldn't forget.
会議では付箋代わりにポストイットを使って意見を整理した。
In the meeting we used Post-its instead of sticky notes to organize opinions.
ポストイットは簡単に剥がせるので仮のメモに便利だ。
Post-its peel off easily, so they're convenient for temporary notes.