The two types of spherical mirrors are concave and convex. Each type reflects images in a different fashion. This is due to the curve of the mirror. A good example of how a curved mirror alters an image can be seen in a fun house mirror. The image reflected back can make a person look tall and skinny or short and fat.
A concave mirror is one that curves in like a bowl. The image is seen inverted. The image can be smaller, the same size or magnified depending on the distance from the concave mirror.
A convex mirror is shaped like the outside of a bowl. The middle of the convex mirror is raised from the edges. Images will always appear erect and virtual. The size of the image will be reduced.
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Aberration may occur when using a convex mirror if it is not a parabolic mirror. A parabolic mirror uses a surface that is a revolution of a parabola. Images cannot be seen well on a true spherical reflective surface. Most convex mirrors today are made with parabolic mirrors.