'Floaters' are the tiny bits of cellular matter which float in the eyeball liquid. they are left over from the formation of the eyes in the foetus, everyone has them, and they are harmless.
Some people can see them more easily than others - close your eyes against a bright light and you can 'see' them floating in your 'vision. Blink or move your head, and they will move as the liquid in which they float is disturbed.
They are potentially annoying, but they are harmless, and should be simply ignored if possible.