Years ago, if your scissors became blunt over extended use, trying to resharpen them was extremely difficult.
You might as well have thrown them away, and bought a new pair, but Fiskars now make a small sharpener, that is very easy to use.
Most of us will have little use for one, but those who use their scissors on a daily basis, can now buy a sharpener, so that's good news if your after one.