  Cylindric Young tableaux are combinatorial objects that first appeared in the
1990s. A natural extension of the classical notion of a Young tableau, they
have since been used several times, most notably by Gessel and Krattenthaler
and by Alexander Postnikov. Despite this, relatively little is known about
cylindric Young tableaux. This paper is an investigation of the properties of
this object. In this paper, we extend the Robinson-Schensted-Knuth
Correspondence, a well-known and very useful bijection concerning regular Young
tableaux, to be a correspondence between pairs of cylindric tableaux. We use
this correspondence to reach further results about cylindric tableaux. We then
establish an interpretation of cylindric tableaux in terms of a game involving
marble-passing. Next, we demonstrate a generic method to use results concerning
cylindric tableaux in order to prove results about skew Young tableaux. We
finish with a note on Knuth equivalence and its analog for cylindric tableaux.
