The bible talks about giants and they refer to them as Nephilim in the book of Genesis 6:4. Some years ago these people were giants.” These giants lived before the great flood in Noah’s time. This was a period when people were becoming very wicked and far from God.
Some people believe the “sons of God” in this verse were fallen angels who married human women. From this union came the giants. In this view, the giants were not only big in size but also very strong and part of the evil that spread on the earth.
Other people believe the “sons of God” were the good people from Seth’s family line, and the “daughters of men” were from Cain’s line. When they mixed together, sin increased. In this understanding, the giants were simply powerful men or famous warriors, not necessarily supernatural beings.