A mortal sin is a serious violation of God's law that results in the loss of divine grace. In many religious traditions, particularly within Catholicism, a mortal sin must meet three conditions: it must be a grave matter, committed with full knowledge of its seriousness, and done with deliberate consent. Examples include actions like murder, adultery, or theft. Committing a mortal sin separates the individual from God and requires repentance and confession to restore the relationship. In Catholic teaching, the sacrament of Reconciliation is essential for forgiveness, allowing individuals to seek absolution and return to a state of grace.