Inline skates are basically boots/shoes with a line of rollers fixed under each one. They usually have two to five wheels, all arranged on a single line. They must not be confused with the quad skates which have one pair of wheels in the front and one in the back.Now, what is the difference between them and the rollerblades? The Rollerblade is actually a brand name for this type of skates. Over time it became a generic name and soon transformed into a synonym for inline skates.