You can see all options trades entered in all the US exchanges in real time if you can see Time and Sales data - it's in thinkorswim. You can sort the trades by size and see what the biggest trades are. I recommend doing this when you are new to options trading. It's good practice to look at the trades and see if you can figure out which are parts of spreads, etc. Plus it's interesting to see where the big money is pointing. Below is the largest trades in UVXY last Friday....
"If The Fool persists in his Folly he will become wise." - William Blake