The word "gospel" primarily refers to the teachings and message of Jesus Christ as presented in the first four books of the New Testament in the Christian Bible (Matthew, Mark, Luke, and John). It represents the good news of salvation, hope, and redemption found in Christianity. In a broader sense, "gospel" can also signify any principle or doctrine that is accepted as a truth or guiding belief.
The word "gospel" comes from the Old English word "godspel," which means "good news" (where "god" means "good" and "spel" means "news" or "story"). This term was used to describe the teachings about Jesus Christ and the salvation He offers.