A solid state drive is a "hard drive" with no moving parts (ergo, it lasts longer, as it has less parts to worry about breaking, and, wear-and-tear on it is virtually non-existent). Generally, they're faster as well, with faster read/write rates. In my opinion, they're vastly superior to the older mechanical hard drives, and I would second the suggestion of installing one of those instead.
Looking up options for your laptop right now, will edit this post as I find them.