You're welcome...

Oh, you mean when it comes to stocks?  A moat is the amount of defense your product or company has from other companies taking over your business.  Coke has a huge moat, which is it's secret recipe.  No one has been able to duplicate that taste, and many, many have tried.  Apple has OSX.  Microsoft has Windows.  Walmart has so many stores that no one can complete with their prices.  Etc.

You want to invest in companies with large moats.  Groupon has no moat.  As a matter of fact, I was reading that they are taking 50% of the deals!  That's outrageous!  Any company can swoop in and offer to take 5 or 10% on the deal and put Groupon right out of business. All they have is a name and registered users.  If Facebook decided today that they wanted to add a local coupon feature, Groupon would be dead.  Instantly.

If you're going to invest in a company without a moat, it's best to run it short term.  Warner Brothers has a moat called Harry Potter.  That's gone after the next movie.  Scholastic Books had a Harry Potter moat too.  Gone.  Hot Topic had the whole goth fad.  Dying out.

Disney has Mickey Mouse and Disneyland.  Huge moat there.

Find companies with large moats (which I call companies with Name Monopolies.  Companies that you instantly think of when you think of a business or product.)  Buy them on sale and hold them, or flip partial shares and you'll do just fine.

Invest in peace...