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Because that is the shape that is defined by the term "cylinder" and describedas "cylindrical". If it were any other shape, then it would not be a cylinder.
Presumably one is empty while the other one is full.
Another cylinder if you dissect it horizontally. In other cases, the name is unknown.
A (right circular) cylinder has 2 circular faces... one on top, and the other the bottom.
A cylinder with two circles may be a right cylinder or a truncated cylinder. Both of their surface areas can be computed as the product of the circumference of the circle and the cylinder's height. This is based on the assumption that both circles are of equal diameters and parallel each other.