The Eastlake Movement is a fancy name for a time in history when people started to really care about how things looked in their houses. Imagine that you really like playing with Legos and building block towers. You always want your towers to look the best they can be. That's what people in the Eastlake Movement wanted for their houses.
Back then, people would decorate their houses with fancy furniture and decorations, but they were usually REALLY expensive and not very practical. Mr. Eastlake (who this movement is named after) didn't like this. He thought that furniture and decorations should be both beautiful AND easy to use. So, he started designing furniture and decorations that were pretty but also really practical.
The furniture and decorations that Mr. Eastlake designed were popular because they were different from what people were used to seeing. They had really cool designs, but they weren't as expensive or showy.
The Eastlake Movement wasn't just about furniture, though. It was also about making houses more functional. Imagine if your mom or dad bought a new kitchen gadget, like a really cool toaster. If the toaster didn't work very well, or if it was too complicated to use, then it wouldn't be very helpful. This is what people in the Eastlake Movement wanted to change - they wanted stuff in their houses to be pretty AND useful.
So, to sum it up, the Eastlake Movement was a time in history when people wanted to make their houses look pretty, but they also wanted everything in their houses to be practical and useful. And Mr. Eastlake was a guy who helped make that happen.