The Master of Laws (LL.M.) is a degree available to lawyers. Those who already have a J.D. from an ABA-accredited law school can specialize in a particular area of the law through the LL.M. Foreign trained lawyers often seek an LL.M. Foreign-trained lawyers who intend to sit for a bar exam often seek an LL.M. as a credential.
The Master of Jurisprudence (M.Jur.) is a degree for non-lawyers who are interested in gaining a deeper understanding of legal concepts to enhance their professional lives where they intersect with the law. It is not a prerequisite to the J.D. or a means to gain admission to a J.D. program.