What happens if the voltage is too low?

Could you please elaborate on the potential consequences if the voltage falls below the recommended level? Are there any specific issues that could arise, such as reduced performance, increased energy consumption, or even damage to the equipment? How does a low voltage impact the overall operation and stability of the system? Is there a threshold below which the voltage becomes particularly detrimental, and if so, what is it? Additionally, are there any warning signs or indications that could alert us to a potential voltage issue before it becomes a significant problem?