I'm the last one to the party, always lagging behind, Sometimes I'm a bit of a flirt, the last of my kind. Though I hold up the rear, I'm the one you'll always find.

I babble, but I'm not a baby. I'm usually clear and cool. What am I?

Mostly water, green in hue, In a pickle jar I’m something new.

You do this when signing up for a gift list, especially for a wedding or shower. At a store, I hold the cash on hand. As you solve me, the answer begins to do this in your mind.

I was going to explain how computers store information, but ive forgotten