A dropped/ False ceiling is a secondary ceiling, hung below the main (structural) ceiling. It may also be referred to as a drop ceiling, T-bar ceiling, false ceiling, suspended ceiling, grid ceiling, drop in ceiling, drop out ceiling, or ceiling tiles and is a staple of modern construction and architecture in both residential and commercial applications.

Benefits:
Acoustic balance and control was another early objective of dropped ceilings. A noisy room can overstimulate occupants, while a too quiet interior may seem dull and uninviting.

The acoustic performance of suspended ceilings has improved dramatically over the years, with enhanced sound absorption and attenuation. This is sometimes achieved by adding insulation known as Sound Attenuation Batts (SABs), more commonly referred to as “sound batts”, above the panels to help deaden sounds and keep adjacent rooms quieter.

Environmental factors
Indoor environmental quality
Indoor environmental quality includes ventilation, VOC emissions, lighting and thermal system control, thermal comfort, use of daylight for natural illumination, acoustics, and optimization of outdoor view availability.

Sustainability
Many manufacturers of modern dropped ceilings include sustainability as an objective. Sustainable features may include:

Energy efficiency, including daylight efficacy and thermal insulating qualities. This uses the ceiling plane to reflect daylight as well as electrical illumination to maximize lumen efficacy, which also improves the comfort and usability of interior spaces. A common measure of the light reflectance of a ceiling material is ASTM E 1477 for Light Reflectance (LR-1). A level of about 75% is considered good, although higher levels are possible.[7]
Reduced resources needed for construction of the tiles
Recyclable/reused/renewable materials
Integration with infrastructure
Integration with mechanical, electrical, and plumbing (MEP) is important with dropped ceilings, since most of these systems are by definition above the ceiling. Fortunately, most ceiling system products are now designed with this integration in mind. Decisions here can also affect aesthetics as well as access and maintenance.