What does 100 - 240vac to 12vdc mean?

"100 - 240VAC to 12VDC" refers to a power supply unit that can accept an alternating current (AC) input voltage ranging from 100 to 240 volts and convert it to a direct current (DC) output voltage of 12 volts. This type of power supply is commonly used in various electronic devices, allowing them to operate efficiently across different regional voltage standards. The versatility in input voltage makes it suitable for use worldwide.