Can you explain what is original sin?

Original sin is a Christian doctrine that teaches that all humans are born with a sinful nature due to the disobedience of Adam and Eve in the Garden of Eden. According to the Bible, Adam and Eve were the first humans created by God, and they were given free will to choose whether to obey or disobey God's command not to eat from the tree of knowledge of good and evil. However, they chose to disobey God, leading to the introduction of sin into the world.

As a result of Adam and Eve's sin, all humans are believed to inherit a sinful nature from birth, which separates them from God and leads to a tendency to sin. This concept of original sin is central to Christian theology and is believed to be the reason why humans need salvation through Jesus Christ in order to be reconciled with God.