What is the "Extraordinary Form" of the Mass?

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Catholic Answers Senior Apologist Jimmy Akin explains what the "Extraordinary Form" of the Mass is.

Jimmy Akin was born in Texas and grew up nominally Protestant. At age 20 he experienced a profound conversion to Christ. Planning on becoming a Protestant pastor or seminary professor, Jimmy started an intensive study of the Bible, but the more he immersed himself in Scripture, the more he found...