FLAC

FLAC is like a magic box that can take a music song and make it smaller, but still keep all the good sound bits. Imagine you have a big tower of blocks, but you want to make it smaller so you can fit it in your toy box. You take out the blocks that look the same and put them in a bag, then you still have a smaller tower but all the important blocks are still there. FLAC does the same thing, it takes out the parts of the music that sound the same and puts them in a smaller file. This way, you can store more music on your computer or phone without losing any of the quality. It's like having a toy box that fits more toys!