What is the difference between Sleep and Hibernate mode in windows laptop computer

Both sleep and hibernate mode reduce the power consumption.

Figure: Difference between
Sleep & Hibernate Mode

The main difference comes when system/computer loose his power(dis-charge in case laptop),

then in sleep mode all unsaved and open data completely lost but in hibernate mode all the unsaved and open data not lost, it is saved on the disk.

You might also like to read related post:

1. What is the meaning of Sleep mode in windows computer
2. What is the meaning of Hibernate mode in windows computer