A ceiling, in general terms, refers to the upper limit or maximum level of something. This can apply to various contexts, such as finance, where a ceiling might indicate the highest interest rate allowed on a loan, or in economics, where it can refer to price ceilings that prevent prices from rising above a certain level. In construction, a ceiling is the overhead interior surface of a room, which can be decorative or functional. It serves to cover the structural elements above and can also help with insulation and acoustics, contributing to the overall comfort of a space.