Paint is mostly used to color, coat, protect, or create designs on items or substrates and is a composition of mastic, Liquefiable, or any liquid which becomes a solid film once dried. Paint comes in different sheens, such as flat, matte, eggshell, satin, semi-gloss, gloss, or high gloss.
Flat interior paints are normally used in common areas with high ceilings or long walls for better touch up abilities. A matte finish has just a slight sheen and usually touches up fairly well and leaves a nicer finish. An eggshell sheen has an angular sheen, provides more washability and durability, depending on the grade of paint used. The lower end paints have an eggshell finish as well, but are used mostly in apartment or rental type structures. In a business or your personal home, the higher end eggshell is more common. Some people like to use the satin finish, but has a bit more sheen than the eggshell and can show more defects in the walls due to reflection of light. Semi-gloss, gloss, and high gloss are typically used for trim, doors, shutters, mantles, bookshelves, and other areas besides the main walls. Commercial areas often use semi-gloss on the walls and it is fairly common since it is usually high traffic areas and not a residential living space.
Exterior paints usually comes in a flat, satin, semi-gloss, gloss and high gloss. Typically, the flat or satin are used on most siding substrates and the higher sheens are used on the trim and doors. Stucco is typically flat due to the roughness of the texture.