On Ebay, coins including Morgan Silver Dollars are listed with the term "MS64" or "MS65" etc. What does this mean?

Thanks!

It's the current way of classifying the condition of the coin. In the old days it went: poor, fair, good, very good...etc. It's been a while since I was an active coin collector, but I believe they mean uncirculated and brilliant uncirculated.

It's the Sheldon scale, named after the numismatist who devised it. MS stands for mint state. The numbers go from 1 to 59 for circulated coins and 60 to 70 for uncirculated. There's also a scale for proof coins listed as PR.
All far too complicated. What was wrong with 'fair' 'good' 'very good' 'fine' 'extra fine' etc with their abbreviations ? By Jove, in my young days...

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What was wrong with 'fair' 'good' 'very good' 'fine' 'extra fine' etc with their abbreviations ?

Thanks for the clarification, Fred. In the old days I could grade coins just by looking at them, knowing exactly what to check out, hair tresses, eagle feathers, wheat lines. Since I've been away from numismatics for decades, I don't have a clue. I don't even know what my collection is worth.