OK - a HDD is a hard disk drive, the historic, traditional, mechanical, spinning platter drives of ye old. they are heavy little metal bricks.
SSD is solid state drive, like USB sticks, use memory cells rather than metal platters, are super fast, very light and physically smaller than HDDs.
unless you open up your PC, you may very well not know the type you have.
so try this, go to Control Panel, (change View By: to small icons in top right corner), click on System, Device Manager, expand the d*** Drives row, and reply back with the entries listed underneath.
the word 'fragmentation' is a legacy of the magnetic storage medium (hard disk drives, floppy drive etc) when data storage and retrieval was fastest if the data was kept contiguous (all together).
if it wasn't, it was said to be fragmented, so defragging software was invented.
with SSD's, by their physical nature and storage mechanisms, data does not have to be contiguous to achieve high reading and writing speeds.
data is kept in 'pages' on 'memory cells', the speed to access different pages in different cells, for us mere human time scales, can be said to be so fast as to be almost instantaneous.
so while technically that data may be 'fragmented' is does not affect performance hence the ignorable fact of those % figures.
then there is the whole other aspect, where defragging an SDD causes so much extra, wasteful activity, that it runs the real risk of reducing the SSD's life span which have a limited number of read/write cycles of each of these 'pages'.