Alright kiddo, have you ever watched a movie or a TV show and there are words at the bottom of the screen that help you understand what the people are saying? Those are called subtitles.
Now, a subtitle editor is a special computer program that helps people create and edit those subtitles. This program has a lot of cool features that make it easier to add subtitles to a video.
For example, if someone is talking really fast or you can't understand what they're saying, you can slow down the video in the subtitle editor to make it easier to follow along.
You can also change the font size, color, and even the position of the subtitles on the screen. This is helpful if someone has trouble seeing or if the original subtitles were too small or in a bad spot.
Another feature of a subtitle editor is the ability to time the subtitles perfectly with what is being said in the video. You don't want the words to be too late or too early or else it won't match up correctly.
So, a subtitle editor is like a tool that helps people make sure that the words on the screen match up perfectly with what is being said in the video. It's pretty cool, huh?