A Solid State Drive or SSD is a form of storage medium that uses a totally different technology for storing, reading and writing of data than normal hard disks disks (HDD).
There are no mechanical or moving parts in an SSD that make it much more resistant to blows and sudden motions ( there are no mechanical heads or spinning disks unlike an HDD). An HDD is very sensitive to bumps and harsh motions that could result in a damaged hard disk.
SDD storage mediums use semiconductor technology to store the data.
An SSD uses less electricity than a HDD.
The main advantage of a HDD over an SSD is the number of read/write operations before the drive is worn out or damaged. Normal hard disks are much more resistant to read/write operations. A file shredder can easily damage a solid state drive because of many write operations done on a file in a very short time like a few minutes.