Difference between normal and SSD hard disks

Normal hard disks use a disk to store data, like the CD, the disk moves in circles and the header finds the place of the folder on the disk and then reads the data that is stored, and simply shows them on the PC.
SSD hard disks are more like to RAM but they are not temporary they use chips to store data, which increases the speed of the data transfer much more than normal hard disks.