Exactly Ayesha. Bloom, from what I have learned so far you are right on. Grounding is to help keep us in the present. It can be done in different ways and while one may work for me, something else may work better for you.
Here are some of the ways I am learning about: Hold something frozen in your hand; notice your surroundinds, what are the colors, what would the object feel like if you were to run your hand over it, what sounds do you hear, what do you smell? Do something physical - cleaning, riding your bike, walking, jogging (whatever) and think about how your body feels, what do the muscles feel like when they are moving, what does the air feel like on your skin? etc. Listen to music and notice the different instruments.
It's really hard to do when you are starting to dissociate so practicing these skills when you aren't triggered is important. Also learning what your potential triggers are, the early physical signs and your thought patterns of when you are starting to dissociate is important so you can start grounding right away before you get too deep into the dissociation.
I am working on these skills myself right now. When I am feeling good it seems ridiculous to be doing, but when I am feeling triggered it's like oh yeah.....god I wish I had been practicing more.
I hope this helps ;o)