*-ring

An O-ring is a small, round rubber ring that looks like a donut. It's called an "O-ring" because it's shaped like the letter "O." The O-ring is used to make things air-tight or water-tight.

Imagine you have a bottle of juice that you want to keep fresh. You take the cap off and notice that there is a small rubber ring around the rim of the bottle. That's an O-ring! When you screw the cap back onto the bottle, the O-ring gets pressed against the opening of the bottle. It blocks any air or water from getting in or out of the bottle. This helps keep the juice fresh.

In factories and machines, O-rings are used in a similar way. Imagine you have two parts that need to fit together really tightly. You could screw them together, but sometimes there are little gaps where air or water can leak through. To make sure that doesn't happen, you can use an O-ring. It gets placed between the two parts, and when they are screwed together, the O-ring gets squeezed really tightly. This makes everything fit together perfectly, with no gaps or leaks.

Overall, O-rings are important little rubber rings that help make sure things stay tightly sealed, whether it's a juice bottle or a big machine. They are simple but very effective!