Why would you buy a solid state hard drive if you dont understand the basics? Now, I do not know your specs. Its possible the solid state drive has two partitions. Its also possible that you have two drives, a smaller solid state drive for running your os, and a larger hard disk for saving your actual data.
The reason that a solid state drive is good is because its much faster then sequential reading of data that a hard disk does. However the speed advantage is usually in your actual loading of programs and operating system. Not in the loading of your personal files.
Now, its usually advisable to have seperate partitons for your data and your OS, this way if you ever need to reinstall your OS(such as a virus, or a corrupted file) you can without losing any of your data. It also makes backing up all your data easier as its all in one place without other stuff mixed in.
You can install programs into the other partition(or drive), however depending on the program you install it might need to install some its files on your main drive. When you install the program, you tell it to install it to the other parition, and then it will tell you how much space it needs on each drive.
As for gettign rid of it. If the two are actually one physical drive then you can delete second partiton(lose all your data on it) and expand the c partition out. If its two seperate drives you cant. To check, right click on computer and select manage. Choose disk managment. On the bottom panel you should see the drives and it will tell you if you have multiple drives or just multiple partitions.