Final answer:
Sleep mode saves the current session to RAM, enabling low power usage and quick resume of tasks. It is different from Hibernate, which saves to the hard drive and is used for longer periods of inactivity.
Step-by-step explanation:
The mode that puts the computer in low power usage while keeping the programs in RAM is known as Sleep mode. When a computer is in Sleep mode, it saves the current state of the system's operations, including open documents and running applications, into the system's RAM, allowing for a faster resume time when compared to completely powering down or using Hibernate mode, which writes the state to the hard drive. Sleep mode is ideal for short periods of inactivity, as it allows the user to quickly return to their work.