What is a mortal sin?

Can you tell me what sins are mortal? Everywhere I look it says it is a grave sin or something like that. I would like to know examples of mortal sins and what makes them different from venial sins?

This link should explain the Roman Catholic Church’s teachings on mortal and venial sins. If you have any further questions or concerns that are not answered by these links, please contact Catholic Answers directly.

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How can I explain the Church’s teaching on mortal and venial sins?

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