Every camera manufacturer is has some type of stabilization. For some cameras like Canon and Nikon, the stabilization is built in the lens, for others like Olympus, Pentax and Sony, the stabilization is built into the camera. Some camera manufacturers claims 3EV gain, the newer ones are claiming 4EV and Nikon is now claiming 5EV of stabilization. Most people doubt these claims then they show their photos where they didn't get the 4EV gain. That's because they don't know how to make it work!
Here is a serie of 6 consecutive photos with the IS. 3 consecutive photos where the IS didn't work as expected and 3 consecutive photos where the IS gave me the full 4EV gain.
I'm using Canon, but this is the same for all the camera manufacturers: Canon, Nikon, Sony, Olympus, Pentax…
These photos are photos of Wile E. Coyote, from the RoadRunner cartoon. BTW, the E stands for Ethelbert.