What makes a compound miter saw "compound"?

I am considering buying a miter saw but I'm not sure that I understand what a "compound" miter saw is. Does compound mean that the blade tilts left to right as well as moving left to right on the base? If so, does that mean that a "miter saw" does not tilt? I am looking at the Delta... show more I am considering buying a miter saw but I'm not sure that I understand what a "compound" miter saw is. Does compound mean that the blade tilts left to right as well as moving left to right on the base?

If so, does that mean that a "miter saw" does not tilt?

I am looking at the Delta Shopmaster MS-265. On one listing it is stated as being a miter saw, and on another listing it is called a compound saw - hence my confusion.
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