UPS stands for two primary things depending on the context:

• United Parcel Service : This is the most common meaning, referring to the American multinational shipping, receiving, and supply chain management company founded in 1907. UPS is known worldwide for its courier services, including ground and air shipping, and operates the UPS Store retail chain

• Uninterruptible Power Supply : In technology, UPS refers to a device that provides automated backup electric power to equipment when the main power source fails. It offers near-instantaneous power during outages and protects against power quality issues, commonly used for computers, data centers, and critical medical equipment

Other less common meanings exist but these two are the most widely recognized.