When you want to draw a really big picture, you can't just draw it all at once. That's because it would take too much time and memory. Instead, you can divide the picture into many smaller pieces, like a puzzle. Each little piece is called a tile.
Tiled rendering is when you draw each tile separately and then put them together to make the big picture. It's like drawing a puzzle!
When you use tiled rendering, you can also draw the tiles at different times, on different computers, or even on different parts of the screen. This way, you can make the picture faster and more efficient.
Think of it like coloring a huge coloring book. You can't just color the whole book at once, so you color one small section at a time. Once you color all the sections, you put them together to make the big picture!