This paper discusses the current understanding of what has been called nominal concord, whereby modifiers of a noun match certain features of the noun (e.g., gender, number, or case features). Part I discusses existing understanding of concord, remaining as descriptive as possible. Concord has been argued to involve gender, number, case, and definiteness, and nearly every word class that can be present inside nominal phrases is capable of showing concord. I consider some questions concerning the typology of concord, which is largely uncharted territory. Part II focuses on existing formal analyses of concord. Analyses of ϕ‐feature concord are rather varied, but analyses of case concord more or less converge on the same mechanism. Finally, I consider the insight offered by analyses of cases of mixed concord, where modifiers do not all match each other or the head noun in features or feature values.