Imagine you want to watch a movie but your internet is sometimes slow and sometimes fast. That can make it difficult to watch the movie because it can stop playing or take a long time to load.
Adaptive bitrate streaming is a way of making the movie easier to watch by adjusting the quality of the video depending on how fast or slow your internet is.
Let's say you start the movie and your internet is fast. The movie will start at a really good quality so it looks clear and sharp. But then, halfway through the movie, your internet slows down. The movie will automatically change to a lower quality so it continues playing smoothly and doesn't stop.
And vice versa. If the internet speed picks up, the quality of the video will increase back, making the experience even better.
It's like magic! You get to watch your movie without any interruptions or delays, even if your internet speed changes.